Do-it-yourself electronic coolant temperature gauge. Homemade digital engine temperature sensor on the dashboard

16.10.2019

Motors that operate in high load modes (constant driving at high speeds, on the original engine, etc.).

As for the coolant temperature, it must be constantly monitored on any power unit, and accurate information will help to avoid. At the same time, it is important to take into account that the standard sensor on many cars gives a very mediocre idea of the degree of coolant heating.

Also, some models straight from the factory are completely devoid of an engine temperature gauge on the dashboard. In such cases (when there is no indicator or it shows only average values), drivers usually install a third-party engine temperature sensor (the digital analogue provides more accurate data compared to the standard solution). Let's look at this device in more detail.

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Engine temperature indicator: features

Let's start with a common situation. For example, a car has a standard temperature gauge, but on such devices the scale may often not have calibrations, and the engine’s operating temperature needle in the middle position displays the real picture only conditionally.

At the same time, during operation, the driver notices that if the middle on the scale is the norm, then in various situations the arrow can rise noticeably higher (for example, in traffic jams). It would seem that the motor is overheating.

Naturally, the movement of the car immediately stops, the owner hurries to turn off the engine and open the hood. However, upon inspection of the unit is not. Next, a restart is performed and it turns out that it does not even turn on, although the device is operational.

When feeling, the upper radiator pipe has an acceptable temperature, antifreeze does not “press” anywhere, the lower pipe can be completely cold, etc. A further check of the coolant level and the condition of the coolant itself also shows that the liquid is normal, the interior heater (stove) is working normally, there are no air locks in the system, it is also in good order.

It also happens that if you let the engine cool down completely, then start the engine and warm up the power unit to operating temperatures, this process can take a long time (judging by the indicator on the instrument panel). At the same time, you can notice that although the arrow has only slightly risen, and the radiator fan is already working, the lower radiator pipe is warm, etc.

If we consider that everything is in order with the fan and the cooling system, then the signs described above indicate a large error or problems with the engine temperature gauge. It is quite obvious that in such a situation it becomes difficult to understand when the engine reaches operating temperatures, whether the internal combustion engine is overheating, how much it is necessary to warm up the engine before a trip, etc.

At the initial stage, many drivers begin to look for the cause. Some at once:

regular temperature sensors on the engine and in the dashboard are checked;
the wiring is ringing, etc.

In some cases, the problem can be solved, while in others it is still not possible to achieve the correct operation of the standard temperature indicator. The fact is that often the culprit is the control electronic modules, which give a certain failure.

Changing such modules is expensive and impractical. In this situation, a digital engine temperature indicator is a qualitative solution. Such an electronic sensor has a quite reasonable cost (on average, from 15 to 55 USD), it is relatively easy to connect and install. The range of measured temperatures is also very wide (on average, from -65 to +240).

Note that on different types of internal combustion engines, the installation features may differ slightly.

The device is usually powered by the ignition switch.
The digital panel is installed in a convenient place in the car.
As for the sensor itself, for accurate readings it must be immersed in coolant.

In other words, the device must be screwed into the block or cut into the pipe. To do this, some drivers replace the standard temperature sensor by simply screwing in a new one instead. However, this cannot be done on cars with for a number of reasons.

The fact is that the controller receives readings about the coolant temperature. In this case, it is necessary to separately implement the installation of the digital indicator sensor, since it is strongly not recommended to remove the standard temperature sensor from the system.

Summing up

Now a few words about practical operation. If the sensor is installed correctly, then the error of its readings will be minimal (no more than 1 degree Celsius). The presence of this device in the car allows you to constantly monitor the temperature of the engine and coolant.

At the same time, it should be noted that the indicator can also be used to check the operation of the thermostat and the declared thermostating temperature. If it is simple, for example, the thermostat should open at a temperature of 85 degrees.

The engine first warms up to medium temperatures, then you can take hold of the radiator pipe. When it gets hot, it will indicate the thermostat is opening. At the same time, the declared thermostat opening temperature should also be displayed on the indicator, that is, all the same 85 degrees (adjusted for error). Also, among the advantages, one should highlight the possibility of accurately monitoring the temperature of not only a hot, but also a cold motor.

Finally, we note that the most crucial moment during installation can be considered the installation of the sensor itself on the engine. The device must be sealed. Also, increased requirements are put forward to the reliability of its fastening. It is important to avoid even the slightest leakage of antifreeze from the cooling system, which can occur precisely at the installation site of the digital engine temperature sensor.

Purpose

There are many sensors in the car. All of them control the operation of various systems of the car and its engine. If the sensors give incorrect readings, then the performance of the car is compromised. The same can be said about DTOZH.

DTOZH is designed to maintain stable operation of an internal combustion engine (hereinafter referred to as ICE). Due to DTOZH, the car warms up faster and reaches too high temperatures less. Some confuse DTOZH with a coolant temperature gauge sensor. These are two completely different devices.

DTOZH provides its readings to the electronic engine control unit, and the second sensor notifies the driver about the temperature of the working fluid in the cooling system. The failure of the second sensor does not lead to serious consequences, unlike the first.

Speaking of DTOZH, one should also mention the purpose of the engine cooling system, since the work of these two units is inextricably linked. The most commonly used liquid cooling system, the main task of which is to remove heat from the engine.

In addition, the system also performs the functions of cooling oil in the lubrication system, air that circulates in the turbocharging system, exhaust gases, and transmission fluid. It also has the function of heating the air in ventilation and heating systems.

The operation of such an important car system directly depends on such a small detail as DTOZH. Therefore, do not underestimate the sensor and neglect its diagnostics.

DTOZH in its design resembles a resistor. The design of the sensor provides for a change in its resistance to electric current with fluctuations in ambient temperature. These changes are recorded and used to issue commands to the internal combustion engine.

The forerunners of modern DTOZH were thermal relays. Thermal relays were installed in injection systems. When the contacts were in the open position, the motor would heat up. If the contact closes, then the engine has already warmed up enough (reached operating temperature).

The device of modern DTOZH is based on a thermistor, which establishes the dependence of resistance on temperature. The thermistor is based on oxides of cobalt and nickel. With an increase in temperature in these substances, the number of free electrons increases, due to which the resistance decreases.

Some thermistors in DTOZH are characterized by a negative temperature coefficient. In this case, the thermistor gives maximum performance when the engine is cold. A voltage of about 5 volts is applied to the sensor. After that, as the power unit warms up, the resistance decreases. The electronic control unit (hereinafter referred to as the ECU) of the engine monitors the change in voltage and calculates the temperature of the liquid. After the engine warms up, the ECU starts to lean the fuel mixture. A malfunctioning DTOZH can also lead to an erroneous enrichment of the fuel mixture. The result of this will be increased atmospheric pollution and premature failure of candles.

If the number of revolutions of the engine at start-up is insufficient, the engine may stall. A floating command from the ECU to increase the speed can prevent this. To maintain control during engine start, the recirculation valve must be closed until the engine reaches its set operating temperature.

Here, the result of a DTOZH malfunction will be floating engine speed. The engine may also stop. The ignition angle also depends on the functioning of the sensor, since this parameter is regulated by the system. The emission of harmful gases with this adjustment is significantly reduced. Ultimately, the power and thrust of the engine, as well as the level of fuel consumption, directly depend on the operation of the DTOZH.

Thus, DTOZH is very important for the correct functioning of the car.

Where is the coolant temperature sensor located in a car? For different models, the installation location of the DTOZH is different. Most often it is installed in the cylinder head near the thermostat housing or on it. It is mandatory to locate the sensor near the outlet pipe, through which the coolant flows back to the radiator. This arrangement is necessary for the accuracy of data transmission to the ECU.

Types of sensors

DTOZH are classified according to the principle of dependence on changes in resistance:

DTOZH with a negative temperature coefficient. The principle of operation of such sensors is that the internal resistance decreases as the temperature rises and vice versa.
DTOZH with a positive temperature coefficient. The principle of operation is opposite to the previous type of sensors. In these sensors, the resistance increases as the temperature rises.

Currently, the first type of sensors is the most popular. Sometimes two sensors are found in a car at once: the main and the secondary.

The main sensor performs the function of transmitting the temperature value to the computer, and the additional sensor turns on the fan.

DTOZH malfunctions and their symptoms

It is generally accepted that DTOZH is quite reliable due to its simple design. However, sooner or later, almost every unit of the car is subject to wear. In the case of DTOZH, there is a violation of the calibration. Such a violation leads to an unplanned change in resistance and incorrect operation of the computer.

The most obvious sign of a failure of the DTOZH is the absence of the fan turning on while the temperature rises above the set values.

This indicator is not considered reliable if both the main and additional sensors are present in the car. In this case, the oxidation of the wiring or the failure of the additional sensor will more accurately indicate the malfunction. The main symptoms of a DTOZH malfunction are as follows:

drop in engine speed or spontaneous stop at idle;
longer warm-up time of the car;
rapid engine output beyond the optimal temperature regime during operation;
increased fuel consumption;
loss of control over the car by the driver;
smoke from the exhaust pipe becomes black;
violation of the stability of the engine.

In addition, detonation tapping in the engine is sometimes possible. Some older car models have a dedicated controller. When the arrow of this controller goes beyond the critical zone, the car must be stopped immediately. In this case, sometimes a malfunction of the DTOZH also occurs. And in more modern models, the on-board computer notifies drivers about overheating of the engine. But such a message does not always indicate a malfunction of the sensor itself. Often this happens due to a broken wiring and its oxidation.

A breakdown of the DTOZH rarely worries motorists due to its simple design. But the reasons for failure are still enough. The use of low-quality antifreeze and engine oil leads to the destruction of the DTOZH surface. The sensitive element of the sensor may be covered with sediment in the form of crystals. The reason may lie in a manufacturing defect. You should not buy DTOZH at flea markets and various cheap auto parts markets. DTOZH purchased on such a market will often not meet the declared parameters and the slightest damage will lead to sensor failure. Leaking antifreeze can cause gasket wear. A power surge in the on-board electrical network and corrosion of the contacts can also be the cause of sensor failure.

Checking the performance of the coolant temperature sensor

Necessary tools and equipment

For the procedure of checking, removing and replacing the sensor, you will need the following tools:

key for 19;
multimeter;
a container into which you will drain the coolant (a regular bucket will do);
electric kettle for heating water;
thermometer;
container for hot liquid (a glass or a small bucket will do).

Checking procedure

How to check the coolant temperature sensor? This process is short and does not require any special diagnostics in a car dealership.

Do not forget - in order for the sensor to correctly indicate the temperature of the coolant, it is necessary that the DTOZH be immersed in this liquid. To do this, you must regularly check the presence of refrigerant in the system. This check is the first step that should be taken if a DTOZH malfunction is suspected.

The next step is to check the contacts for oxidation and corrosion. It is also necessary to identify violations of the connection of DTOZH to the system. After studying the car's operating instructions, check the number and location of the sensors. After that, find DTOZH and establish that everything is in order with its connection. To do this, DTOZH will have to be dismantled, since the check is associated with its immersion in a container for hot liquid.

Take the sensor and lower it into a container of boiling water. Next, you need to measure the resistance at the output. In this case, the sensors on different car models will show different values. Tables are available on the Internet with the optimal resistance for each model.

If the indicators of the reference and measured values \u200b\u200bare different, then the DTOZH must be replaced. The design of the sensor is so simple that it does not provide for repair.

How to check the coolant temperature sensor? It is necessary to lower it into heated water (as mentioned above). Then take a thermometer and lower it into a container of cold water. The use of an electronic thermometer is recommended. Connect a multimeter to the sensor that is configured to measure resistance. Then lower the DTOZH into the water and take measurements. Then the container with cold water is heated to 15, 20, 25 degrees, and the obtained measurement results are recorded. If the results do not match the reference, a replacement will be required.

There is a way to check DTOZH without a thermometer. The temperature of water at boiling reaches 100 degrees. This temperature is taken as a basis and the resistance is measured. When boiling water, the resistance should be approximately 176.7 ohms. With errors, it can reach about 190 ohms. In the event of a mismatch, the sensor will also need to be replaced.

As an example, below is a table of temperature versus resistance.

Temperature in degrees Celsius	Resistance (ohm)
0	5 000 — 6 500
10	3 350 — 4 400
20	2 250 — 3 000
30	1 500 — 2 100
40	950 — 1400
50	700 — 950
60	540 — 675
70	400 — 500
80	275 — 375
90	200 — 290
100	150 — 225

Replacing the coolant temperature sensor

Replacing the coolant temperature sensor is easy to do yourself. Before replacing, it is necessary to first drain the coolant into a prepared container. Next, the old sensor is dismantled. DTOZH is screwed into a special threaded hole. Unscrew and remove it, and then install the new sensor in reverse order. Before installation work, check the exact location of the sensor in the operating instructions for the vehicle.

After purchasing a new sensor, it is recommended to check it for defects using the methods described above. Before screwing a new sensor into the seat, it is recommended to treat the thread with a sealant. After installing a new sensor, wiring is connected to it. Then the coolant in the system must be brought to normal. That is, liquid leakage is unacceptable. After making sure that they are absent, you can start the engine.

Conclusion

We found out that DTOZH is a necessary component of the power unit. Its failure can lead to serious violations in the performance of the car. The signs of a DTOZH failure are very diverse and can be easily confused with the causes of failure of other vehicle components.

SPECIFICATIONS

Article: 9280

Universal engine temperature indicator with diagnostic function

The indicator is designed to display the temperature of the coolant in digital form, as well as display and erase diagnostic codes that occur when malfunctions occur in the engine and transmission control system. The indicator is used in vehicles equipped with a digital information bus CAN.

ATTENTION! The indicator does not work on cars of the VAG group (Volkswagen, Audi, Skoda, Seat).

SPECIFICATIONS

LIST OF SUPPORTED VEHICLES

The list of cars will increase as tests are carried out.

ATTENTION! The indicator does not work on cars of the VAG group.

METHOD OF CONNECTING TO THE VEHICLE

The coolant temperature is displayed on the indicator for a few seconds after the ignition is switched on. The indicator periodically sends a request to the CAN bus and updates the temperature readings.

The engine and gearbox are diagnosed when the ignition is turned on, the indicator displays the number of stored errors in the EXX format, where XX is the number of errors. Further, the running line displays the error codes. The code consists of five characters: one letter and four numbers. Decryption codes can be found on the Internet. After displaying all errors, the indicator will show the temperature of the engine.

To erase the codes from the memory of the car's blocks, you must turn off the ignition, then press the accelerator pedal to the maximum, turn on the ignition and wait for the "clr" error erasing notification to appear on the indicator. If the errors persist, repeat the erasing procedure.

A variety of signaling devices are used to monitor the operation of an internal combustion engine. We propose to consider how the coolant temperature sensor works, how it is checked and replaced if it is faulty.

What it is

The standard coolant sensor is a device that is used to measure the antifreeze found in an internal combustion engine. The fixed sensor parameters are returned by means of signals to the engine control unit, which in turn uses this data to adjust the required amount of fuel and a certain ignition angle.

Without this thermometer, it is really difficult to understand when our engine is running at operating temperature, and the time it takes to reach it depends on different factors, such as the conductivity that we practice in the first moments, or the environmental factor, the outside temperature. It is for this reason that the precautionary principle should take precedence. It is better to heal ourselves with health, the sin of precaution, avoiding taking our car's engine to high speed for a few minutes, than the sin of daring to turn the engine too long.

To do this, we do not have to stand idle. The temperature of a coolant thermometer will not necessarily tell us that our car's engine has reached operating temperature. What is the difference between an oil thermometer and a refrigerant thermometer? Needless to say, it's important to make a distinction between a coolant thermometer and a lubricant thermometer. The former is usually indicated by the pictogram of a thermometer in water, and the latter by a bottle of oil. On the dashboard, in an additional console with three meters, we find the lubrication temperature, the turbo pressure and the pressure in the lubrication circuit.

In some car models, the signaling device can be used to switch to an electric ventilation cooling system. Let's say this is how the car coolant temperature sensor works in the VAZ-1117 (and number 1119) Lada Kalina, Lada Priora and Grant, Lanos, Toyota Camry (Toyota).

Photo - coolant temperature sensor VAZ 2010

These meters are especially important in a sports car where it is understood that your engine will need to respond to the demands of heavy use. Its absence in other versions, less powerful and in other cars, does not answer any other aspect, but that the manufacturers consider that they are not relevant to their customers. And in this case, they consider it preferable to keep their installation rather than saving, but above all to show us a simpler and clearer instrument panel.

Excess refrigerant temperature may show a problem in the radiator or lack of refrigerant, a frequency that we must resolve as soon as possible to avoid serious damage. The fact that the coolant temperature has reached what we consider normal does not necessarily indicate that the engine lubrication has reached operating temperature. That is why we consider this indicator to be so important.

On many foreign cars, the instrument readings are also displayed on the dashboard. For example, in Volkswagen Golf (Volkswagen Golf), Subaru (Subaru), Mazda (Mazda), Opel Vectra (Opel Vectra) and Passat (Passat), BMW (BMW), Ford Focus (Ford Focus), Daewoo Nexia (Daewoo Nexia), Fiat (Fiat), Audi (Audi) and others.

As the temperature of the sensor is measured, its resistance level may change. Exists two kinds such sensors depending on the change in resistance:

Why is it so important that we do not neglect oil changes, and that our precaution increases with the demands of use? In the flow of engine operating temperature, it is no wonder why it is very important to be very careful and respect our car's maintenance periods. But we must not forget that the performance of this lubricant, and therefore its ability to protect those components that are subject to friction, not only decreases with cold, but also with use, weather, climatology, or even the requirement What we make of our machine.

Sensors with a negative temperature coefficient, work on the principle: internal resistance decreases with increasing temperature and vice versa;
PTC sensors. As the temperature rises, they increase the resistance.

Almost all cars have signaling devices with a negative coefficient. There are negative coolant temperature sensors in Gazelle, GAZ, MAZ, Kamaz, Mercedes, Nissan, Niva, Mitsubishi, OKA, Peugeot, Volvo, Renault Logan (Renault Logan), OPEL Astra (Opel Astra), Geely, ZMZ.

Most of the time, the goal that leads to the installation of air conditioning is to give the person an environment that is more conducive to his well-being. On the other hand, it is an effective way to protect against infections and air pollution from large settlements in enclosed spaces. It helps in the therapeutic treatment of many diseases; in industries, is a factor contributing to the increase in production due to higher incomes of workers placed in more comfortable conditions.

Air conditioning is an air treatment system that permeates a specific location to provide specific temperature and humidity conditions. Treatments can be very different as the desired conditions vary depending on the location being served. For example, a food storage warehouse requires conditions that are different from those required by a large commercial store, office, or movie theater viewing room.

Photo - temperature sensor

The principle of operation of the sensor

The vehicle control unit sends a regulated voltage (9 volts) directly to the coolant temperature gauge sensor. Depending on the drop in voltage at the contacts of the signaling device, the resistance will drop, which will immediately fix the control unit.

These varied needs have resulted in numerous air conditioning systems differing in size, design and control equipment. However, the principle of operation does not change significantly from one to another, from small to large. In the body of higher animals, and in particular in the human body, a series of chemical transformations occurs, through which the absorbed food is converted into thermal and mechanical energy. This heat production depends on many factors. One of them is the constant exchange of heat between the body and the environment.

In such a case, the automotive computer or mechanical system will be able to calculate the engine temperature, and then (using data from other instruments) apply lookup tables to perform adjustments to the engine actuators, i.e. change the level and flow of fuel or the ignition timing.

This change depends on the air conditions in which the body is immersed, depending on the temperature difference between the surface of the body and the environment, with ventilation, etc. At air temperatures close to air, the heat generated by the body is not easily removed, and the individual feels a sense of oppression. During these hot seasons, a very humid atmosphere saturated with water vapor is just as harmful as excess heat, because it does not allow sweat to evaporate. For this reason, the air conditioner must regulate not only the temperature, but also the amount of vapor contained in the air.

Photo - diagram of the coolant temperature sensor

The resistance of the coolant sensor is very dependent on external factors. This is the air temperature outside the car, various features of the drive. For the most correct operation of the signaling device, you need to use the coolant recommended for a certain time of the year, it is expensive, but prolongs the life of your car.

In addition to temperature and humidity, there is a third factor that affects the state of the air: ventilation. These three are not independent; they interact in such a way that in conditioning a change in one must be compensated by a corresponding change in the other two, so that the body is always in a state of sufficient comfort.

There are several stages in a large air conditioning system. However, objects do not always include all components, which in small units are combined into one box. The air first enters the site, where it mixes with the recirculated air of the environment itself, because only a certain proportion of fresh air is required. The mixed air then passes through a filtration section, which can have two stages. The first removes thick dust using a fibrous material, usually fiberglass, in the form of a screen, which is replaced when dirty.

Video: checking the engine temperature sensor

Sensor replacement

To start repairing the coolant sensor, you need to determine its location. Most often it is installed near the thermostat or radiator, in some cases the on-board computer uses readings from both sensors or one of them, depending on the brand of car and its model. For example, this is how the sensor is located in Renault, Chevrolet, Citroen, Skoda, Chery, KIA, Subaru Impreza.

The second stage filter, which is usually of the electrostatic type, then removes smaller particles such as cigarette smoke. In this filter, high voltage is used to electrically charge dust particles, which are then attracted to a grid of charged plates with opposite polarity. As it passes through two sets of pipes, the air is temperature controlled. One of them circulates hot water or steam, and for the other cold water or refrigerant.

A temperature sensor is installed in the ventilation area, which is set to the desired value. The difference between the desired temperature and the ambient temperature automatically determines whether heating or cooling pipes will be used. The next step is an odor filter made from activated carbon, a substance capable of absorbing odor molecules in the air. The charcoal must be periodically activated with heat to remove the absorbed material.

There are several ways to help you find out that the sensor needs to be changed. If you have all the other systems in your car working, then on the dashboard you will report a malfunction using a light signal. If the car has computer control, then it will be possible to determine the problem by decoding the combination on the monitor.

The desired humidity is generated by injecting steam or very fine water droplets into the air using an evaporator. This is also controlled by a sensor located in the environment. In case of excessive humidity, the usual way is to cool the air and then, if necessary, heat it up in the temperature control stage, so that the humidity will condense in the refrigeration pipes.

From the smallest to the largest system, the same principles apply. Small environment units contain a simple washable filter, refrigeration compressor and electric air heater. Larger environments use larger units, and often the cooling section is placed outside the building.

Photo - temperature sensor on the dashboard

Depending on the year of manufacture of the car, as well as its brand, many motorists note an increase in fuel costs for the engine. But at the same time, you need to understand that you can’t define a diesel engine like that (UAZ, PAZ and others). If you have a mechanic, and not a computer control system, then here signals what you need to buy a new coolant temperature sensor:

His invention will come to help the industry. During the hot summer months, the New York company had problems with print jobs. The paper absorbs moisture from the air and expands. Colors printed on damp days didn't line up, creating blurry and unclear images.

The carrier believed he could remove moisture from the plant by cooling the air. To do this, he developed a machine that circulated air through artificially cooled air ducts. This process, which controlled temperature and humidity, was the first example of air conditioning by a mechanical process. However, the textile industry became the first major market for air conditioners, which was soon used in many buildings and establishments in paper, pharmaceutical, tobacco and commercial establishments.

The car began to consume more fuel than usual;
When the car starts and the engine reaches its maximum temperature, it stalls;
There were problems with the launch;
Black smoke comes out of the muffler pipe.

Consider how the G62 type coolant temperature sensor is replaced on a Kia Sportage with a 2-liter engine. A similar instruction is also useful when repairing Acura, BMW, Buick, Chevrolet, Ford, Toyota, Volkswagen, VAZ 2110/2112 injector, Renault Grand Scenic and others.

The first residential application was in a Minneapolis mansion, in Carriere designed special residential equipment, larger and simpler than today's air conditioners. The system introduced extra moisture into the preterm nursery, helping to reduce deaths from dehydration.

In fact, air conditioning helped the film industry because during the summer months the frequency of cinemas dropped a lot and several rooms closed at that time. Also in the 1930s, Willis Quarry developed a system that made air conditioning more viable in skyscrapers.

Photo - different coolant temperature sensors

In this model, if the coolant sensor breaks, an alarm 117 is received, which indicates that further operation of the device is impossible and a new signaling device must be installed. In Chevrolet, PO118 is a high signal. General scheme of work looks like that:

In the 1950s, models of residential air conditioners began to be mass-produced. The shares were sold two weeks later. Ten years later, these plants were no longer new and still bring solutions in all parts of the world. Energy efficient appliances will go a long way in your light bill, especially in summer when air conditioning makes up a third of a home's energy consumption.

Avoid excessive cold by properly adjusting the thermostat. Install the appliance in a place with good air circulation. Keep doors and windows tightly closed to keep air out of the environment. Clean filters periodically. Dirty filters prevent free air circulation and increase the performance of the device.

Advice from motorists on the forums: if for some reason you cannot immediately understand the coolant temperature sensor in the event of a breakdown, then you can connect an additional one instead (such a connection may differ slightly from the main one in terms of temperature).

Protect the outside of the device from sunlight without blocking the ventilation grilles. Get used to turning off the air conditioner when you have to leave the room for a long time. Avoid solar heat in the environment by closing curtains and curtains. Do not block the air outlet of the device.

When buying, give preference to models with programming features, such as a timer. It is very important that the size of the selected unit is appropriate for the site size and heat load, because if the installed unit is lower than the ambient heat load, it must operate for longer periods of time, hence consuming more energy, until it reaches comfort temperature.

The temperature gauge is powered by a sensor. As a rule, coolant temperature sensors in a car do not require any maintenance. But often a motorist has doubts about the correctness of his testimony. A faulty temperature sensor can cause engine damage, the repair of which will result in a tidy sum. In this case, check the correctness of his testimony.

You will need

tool kit, tester, hot water, 100 ohm resistor

Sponsored by the placement of P&G Articles on the topic "How to check the temperature gauge" How to raise the temperature of the engine How to replace the coolant temperature sensor Why the engine is running hot

Instruction

Disconnect the engine coolant temperature sensor connector while the engine is off. Take a 100 ohm resistor and connect it to the temperature sensor connector. After that, turn the key to turn on the ignition. If the temperature gauge is working, the arrow on it should show 90 ° C. The engine must be cold during this work. If the arrow on the dashboard does not show anything, ring the wiring leading to the temperature gauge. In the event that the wiring is intact, and the pointer does not work, simply replace this device - the problem is in it.

If the pointer is working properly, connect the connectors to the coolant temperature sensor. Start the engine and let it warm up completely. If the temperature gauge does not show anything, or its readings do not correspond to normal engine temperature, the problem is in the sensor itself, replace it.

There is another way to check the temperature gauge. Disconnect the negative battery terminal on the vehicle. Drain the antifreeze from the engine so that it does not spill when unscrewing the sensor. The engine must not be hot. Slide the protective cambric off the harness that fits the sensor and disconnect it from the connector to which it was connected.

Using a wrench, carefully loosen the sensor, and then unscrew it from its socket. Take the tester, adjust it to the ohmmeter mode. Attach one contact to the output of the sensor, and the second to its body. The tester should show a resistance of 700-800 ohms at room temperature. When the sensor is immersed in hot water, its resistance should decrease, and as the water cools, increase again. If this does not happen, the problem is in the sensor. In the event that the sensor is intact, call the wiring, and, if necessary, change the temperature gauge.

How simple