A malfunction in the operation of the stove fan is detected when the device is turned on, while switching its speeds. If, instead of the usual sounds of a running fan, howling sounds appeared, or the sounds disappeared altogether, then the fan is faulty. If sound appears only at one speed, and at others it is absent, then either the switch or the resistor is faulty. Watch the video "Oven does not work - troubleshooting" below.
The stove fan usually does not work for the following reasons:
1. The contact in the mounting block is broken. The problem is solved either by replacing the entire connection, or by cleaning the contact, in case of its oxidation.
2. The ignition relay has failed. With this malfunction, the stove fan starts to work only after the car has warmed up. The relay needs to be replaced.
3. The fuse is out of order. In the fuse box, it is marked F-7 and if it fails, then some other devices will not work, such as a cigarette lighter, headlight washer, etc. Usually, the fuse blows due to a short circuit in the electrical network, so you need to replace the fuse and at the same time check the entire electrical circuit to find the problematic place in which the short circuit occurs.
4. A malfunction of the additional resistor of the stove motor can be suspected if, as already mentioned, the stove only works at one, third speed. Solution: Replacing the resistor.
5. A malfunction of the stove switch, as a rule, occurs in cases where the resistor has been changed, and the stove fan continues to operate at only one speed. Then you need to check the circuit and switch.
How to check the heater switch? Very simple:
- you need to take a 12V light bulb, solder 2 wires to it,
- to get to the switch,
- turn on the ignition,
- connect the minus of the bulbs to ground, plus - to the outputs of the additional resistor, indicated in the diagram below, numbers 1, 2, and 3. If the bulb is on, then everything is in order with the switch,
- otherwise (the light is off) - you need to connect it to the "plus" of the stove switch (yellow-blue wire in the diagram). If the light does not light up, then there is an open circuit in the electrical circuit, or the fuse has failed.
In the diagram: 44 - fan motor, 45 - additional resistor, 46 - stove switch
6. The fan motor is out of order. This is not so common, but it still happens when the stove fan does not work. It is necessary to check the reliability of the contact of the motor with the mass of the fan, whether this happened due to overheating of the motor, and also to exclude the possibility of sticking in its brushes.
Video: The stove does not work - troubleshooting
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Many car owners, unfortunately, face an unpleasant problem when the stove in the car does not heat well. If in the summer no one pays attention to this, then in the winter you have to quickly look for a way out of this situation. Today's article is devoted to finding a way to fix a breakdown in the interior heating system. Otherwise, you will have to freeze before the onset of heat.
Simple recommendations from the authors of a very useful automotive resource Autopub will help you get rid of this trouble and enjoy the comfort while operating the car. We will consider several scenarios for the development of events - if the stove stopped working at one fine moment and if the stove does not heat well, but still works.
The oven suddenly stopped working
If the stove stopped functioning while driving and coolness began to blow from the holes, we advise you to stop driving and check the amount of fluid in the car's cooling system. To do this, open the hood and pay attention to the fluid level in the expansion tank. As a rule, if the temperature in the cabin drops very sharply, the problem is a coolant leak.
If the level is really low or there is no liquid at all in the tank, check the condition of the hoses and pipes (pay special attention to the places where they connect). It is also worth inspecting the stove radiator and engine cooling radiator. Solving the problem in case of mechanical damage to the pipe on the road is not easy. Replacing the element, of course, will not work, but you can at least temporarily restore its performance. The usual electrical tape will help with this. If the nozzle is very long, you can cut off the damaged part, if after that it can be used further.
Immediately after eliminating the cause of the coolant leaving, it is necessary to add it to the required mark. Instead of antifreeze or antifreeze, you can use water, this will help you get to the place of a full repair. As a last resort, fill the tank with snow. This is much better than overheating the engine and stopping altogether.
Furnace blows unevenly
Sometimes the heating system provides the supply of hot and cold air into the passenger compartment. The reason for this phenomenon is the ingress of air into the cooling system. This happens in the following situations:
- the joints of the branch pipes are leaking;
- air entering the expansion tank during the replacement of the coolant;
- failure of the expansion tank valve.
After determining the cause, you need to get rid of the cork. To do this, open the cover of the expansion tank and press the accelerator pedal several times, and the temperature of the engine should not be below 90 degrees.
The fan is working, there is enough liquid, but the stove does not heat
The culprit of the problem may be a control element in the passenger compartment. A normally operating lever should open a tap located on the heater core. This leads to the beginning of the circulation of liquid throughout the cooling system.
Sometimes the stove may not heat well due to damage or disconnection of the cable that connects the Cold / Heat control lever to the faucet on the stove radiator.
Fan does not rotate
As a rule, it is necessary to look for a breakdown already in electrical equipment. First make sure all fuses are good. If necessary, replace the corresponding element. Sometimes the power button doesn't work. Checking its performance is easy - the wires are connected bypassing (directly).
The most serious breakdown, due to which the stove does not heat up, is damage to the stove fan itself. We'll have to change the fan, and it's not so easy to do.
The stove blows warm air (not hot)
Probably, the engine has not yet had time to warm up to the required temperature. If the arrow on the sensor does not reach 90 degrees, the cause of the problem is obvious. In the case of constant observation of such a phenomenon, it is necessary to make sure that the thermostat is working. Usually in such situations, it must be replaced.
In fact, this list can be supplemented with other recommendations. More about why the stove does not heat well -
With the advent of cold weather, a stove often becomes in demand in a car. A warm, cozy cabin where you can protect yourself from autumn and winter bad weather is the dream of any driver and passenger. But sometimes stove in car heats weakly so much so that there is no question of warming up. If the car also stood motionless for some time, then what to do with severely frostbitten windows is a serious question. Because of what, problems with heating the car periodically begin and? In order to better understand this, you need to get to know the entire heating system better.
In order for the stove to work in full mode and without failures, it is necessary that all its parts are in good condition. It is arranged quite simply and consists of a radiator itself, a special device for regulating the movement of fluid, pipes through which coolant circulates, air dampers and an air duct. The car's heating system also includes a fan. The stove will work if there are no failures in the operation of each of its individual parts.
The main components of the car oven. The stove and its malfunctions.
The main reasons for the failure of the stove
- The heating system will not operate normally if it is got air when changing the coolant.
- Air can enter the heating system if there are damage to the main cylinder block.
- May jam thermostat in the open position. If, with a fairly fast movement, your stove does not cope with heating, but heats up well at low speeds, then most likely this is the problem.
- Also, the heating-cooling system cannot work 100% if clogged heater core. This can happen for several reasons. Insects, leaves and dust get into the radiator. Or sealant could get into the radiator. A problem will arise if water or low-quality antifreeze gets into the radiator.
- Heating failures can also be caused by cabin filter in case of heavy pollution.
- A fairly common failure is failure of the fan. Bearings or brushes can fail, and this will lead to unstable operation of the entire system. There may also be problems directly related to electronics.
These are some of the most common problems. Sometimes, the heating system fails due to radiator damper damage. Air may not get into the system or not get enough.
Poorly functioning radiator dampers and deflectors often cause the stove to work poorly.
The situation is a little different when it comes to domestic cars. We highlight several reasons why the heating system may not work in these cars.
- The heater valve lever has worked. The rubber bands could dry out or the lever itself would turn sour. In this case, you should replace it with a new one along with the radiator of the stove itself.
- Broken top hose. Due to its location in the vehicle, it is very easy to accidentally hit this nozzle. It breaks and is completely unsuitable for repair. It should also be replaced with a new one, after which the operation of the stove should return to normal.
- Could be out of order oven control unit, he is the controller of the heater. This will become noticeable if the fan does not work well in positions 1 and 2. A faulty air temperature sensor in the passenger compartment can lead to malfunctions in the heating system.
A heavily clogged or damaged heater core is one of the main causes of a poorly heating stove.
In order for the stove to always be in working condition and not let you down at the right time, you need to follow a few simple tips:
- Necessary clean radiators regularly from various types of contaminants. The external radiator can be cleaned with compressed air, and if necessary, it can be removed and washed under running water. The internal radiator will also be cleaned with a vacuum cleaner if the level of contamination is not very high.
- When using non-original or simply not quite high-quality antifreeze, growths inside the nozzle channels cannot be avoided. You can easily clean the radiator without removing it. You just need to swap the upper and lower pipes and let the car run a little. You can also clean it with household citric acid or use a special washing liquid. To avoid such a problem at all, it is recommended change antifreeze at least once a year.
- Urgent defective thermostat to be replaced. If it is jammed in the open state, then the stove will not be able to fully warm up the interior, and the car itself will warm up longer. If the thermostat is stuck open, it can cause the entire car to overheat, requiring major repairs.
- If the air from the stove is hot, but its flow is very weak, then it is most likely clogged cabin filter. It is not recommended to use a car without a cabin filter, as all dust and microbes from the street will enter directly into the cabin. Therefore, the filter should be replaced with a new one.
- The heating system will not work well if air bubbles have formed in it. This is not a terrible problem, it can be solved. First you should try expel the air with the engine turned off. Open the cap of the expansion tank, find the hose from the tank to the radiator and try to pour the antifreeze manually. If this method is not suitable, then it is necessary to let the car idle.
- You also need to pay attention to flap control levers the oven itself. If a cable or heater tap has come off, this may be the cause of poor operation of the entire system.
- Periodically follows lubricate the bearings on the stove fan and keep it free of dust.
If, at an outside air temperature of -25 degrees, the stove of your car warms up the interior to +16 degrees from below and +10 degrees from above, the stove can be considered quite serviceable. The temperature in the rear seats of the car should be approximately +15 degrees. The presence of such a noticeable difference between the temperature at the bottom of the cabin and the temperature at the top will ensure a comfortable ride for both the driver and the passenger.
In order to avoid such problems, it is recommended to carry out all preventive measures on time and carefully. This will allow you to enjoy a quiet ride in a well-warmed car. You will protect the glass from the frozen layer, so that the movement will become safer. The longer the life of the car, the more attention its heating system requires. This applies to all cars, regardless of the country of origin.
The good news is that the stove air heating technology is fairly simple compared to a lot of other car systems, as it hasn't really changed over the years. The bad news is that there are many reasons for the failure of the stove, and professional diagnostics are needed to identify some. In order to get a better idea of why a stove might not work and what it takes to fix it, we'll look at how a stove works.
If the stove works, but does not heat (cold air blows)
First of all, it is important to understand the basic essence of how most car heaters work. There are exceptions, but stoves that use water-cooled engines use very hot coolant to warm up the interior of the car. This is achieved by running antifreeze through a special component called a heater rod, which is similar in design and function to a small radiator. When the fan motor draws air through this heat exchanger, this air enters and heats up the interior of the car.
If cold air blows from the stove deflectors, even when the car is warm enough, then there may be several reasons:
- low coolant level;
- blockage in the heater line;
- stove dampers do not work;
- stuck heater valve;
- electronics problem: bad switch or broken wires.
After the car is turned off, some time has passed and the pressure in the cooling system has dropped, you can start by checking the coolant level. If the antifreeze level is low, then this may be the cause of the stove that has stopped working - hot antifreeze simply does not circulate enough through the heat exchanger to receive heat from the stove, and therefore cold air is blowing from the latter.
Topping up the coolant can solve the problem, however, a low coolant level itself often indicates another problem - leaking coolant through a gasket or hose, and in the worst case, even burning coolant in the engine's combustion chambers.
If the check shows that the antifreeze level is normal, then you can start the engine again and let it warm up, and then check the temperature in that coolant flow line where the main heater hoses enter the main heater housing. The safest way to do this is to use a non-contact infrared thermometer - a pyrometer. If all of the main hoses are within the same temperature range as the majority of the coolant line, but one of the hoses is cold, then there is likely a blockage in the heater coil. If the vehicle uses a valve in one of the heater hoses, then it is also important to check the operation of that valve. If the valve is stuck, then the cause of the inoperative stove is most likely to be found in it.
If the stove fan does not work (does not blow)
The other main type of problem with car heaters, other than cold air from the vents, is no airflow from the vents at all. Typically, the reason for the stove not working in this way lies in the electric fan, but it can also be caused by other related components. The only way to determine which component is causing it is to see if it is receiving electrical power at all. The cause could also be the fan resistor, relay or switch. In general, the diagnostic procedure itself will differ depending on the specific vehicle.
If power is supplied to the fan, but it does not rotate, then it is likely that it simply burned out. However, in some cases it can be found that there is so much debris in its rotor that the electric motor is not able to spin the blades. In other cases, the cause may be a broken wire, oxidized wire connections.
If there is no power to the fan at all, you will have to look for the cause in the entire circuit from the fan to the power source, but you should start by checking the fuse. A blown fuse often indicates another underlying problem, so you should not only replace the fuse, but find out what caused it to blow. It happens that replacing a blown stove fan fuse with a fuse of the same rating is enough to fix the malfunction, which means that the problem was exclusively in it.
With the onset of cold weather, a working car heating system is of particular relevance, because no matter how well you dress, it is unlikely that you will be able to ensure comfortable movement by car. Therefore, it is important to know about the causes of failure of the vehicle stove, as well as methods for their elimination and prevention of malfunctions.
Where to look first
Most cars that are found on modern roads are water-cooled, which operates according to the same principle in all modern vehicles: hot coolant, heated by the heat generated by the engine, passes into a small stove radiator, where it transfers this heat to the air coming from the street. Then the heated air streams enter the cabin through special air ducts.
That is, we can say that in order to heat the car interior, you must first start the engine and wait until the antifreeze heats up and warms up the cold air that passes through the stove radiator. In this circuit, some failures are possible, due to which the “heater” refuses to perform the functions assigned to it. In such a situation, it is necessary to carry out a comprehensive diagnosis of the heating system of the machine and look for the cause of this condition.
Pay attention to the coolant level
If you got into a car and suddenly found that your car is very cold and the stove does not heat well, then first of all it is worth checking the level of coolant (antifreeze). In the event that its level in is below the minimum value, it is necessary to add liquid to the normal value. In addition, do not forget to check the thermostat, as it is the most common cause of a malfunction in the interior heating of a vehicle.
Check the thermostat
At its core, a thermostat is an ordinary valve, the operation of which depends on the temperature of the antifreeze in the system. According to the standard settings of the car's cooling system, during the engine warm-up, the thermostat is in the closed position, which contributes to the rapid heating of the power unit in the cold season. If the device is stuck in the open position, then the coolant will constantly run in a circle.
Therefore, when the car is in a “traffic jam” or moves at low speed through the streets of the city, the stove in the cabin will still work, but as soon as you drive onto a wide highway, where the wind will cool its radiator at high speed, the heater will start badly again work. Only a complete replacement of the thermostat will help to eliminate this malfunction.
The main reasons, or what to do if superficial diagnostics did not work
There are times when superficial diagnostics do not bring the desired result, and to answer the question “why doesn’t the salon stove heat up or heat up badly?” fails immediately. Here it is already necessary to understand this problem in more detail. Perhaps, when replacing antifreeze, air got into the system, the main cylinder block or radiator damper was damaged. Also, the cause of a car heater malfunction is often a dirty cabin filter or a clogged radiator.
Air entering the heating system when changing the fluid
When changing the coolant, there is always the possibility of air getting into the system. If this happened to you, then you need to remove it from there as soon as possible. How to do it?
Firstly, it is worth noting that everyone has different methods: some drivers advise to park the car on a slope (“nose up”) and give it a good gas, others believe that a good warm-up of the engine will help to “expel” the air, followed by its complete cooling, but it’s better just slightly warm up the engine (to the point where you can sort it out without burning your hands) and slightly loosen the clamp on the hose. Then you need to remove the hose from the tube, and in such a way that a small gap is obtained, which will release the air lock.
Remember! If an air bubble has formed in the stove, then it will no longer be able to come out, since the radiator has rather narrow tubes, and the antifreeze flows in a very weak stream that cannot displace the air lock.
Damage to the main cylinder block, the cause of air ingress
Not in last place among the possible causes of the problem of a non-working stove is damage to the main cylinder block. As a result of the formation of cracks, the heating system begins to suck in air, which interferes with the subsequent high-quality heating of the coolant.
Radiator damper damage
Another cause of cold in the cabin due to a poorly functioning stove is a damaged radiator damper, which prevents air from entering the system, or it does not enter it in sufficient quantities. If the diagnostics confirmed your guesses, and the stove really does not work due to the above damage, then you will have to change the failed elements and close up all the holes.
Clogged heater core
In cases where the poor performance of the heater is in no way related to the above problems, it is worth checking the “cleanliness” of the stove radiator itself. So, the main enemies of any such device are road dust, fluff, sand and other dirt that gets inside from the street. If these contaminants completely cover the radiator, then the stove will never be able to work at full capacity, and the temperature in the cabin will only rise a few degrees (instead of passing through the grill, the air coming from the street will simply blow around the radiator around the edges).
It should be noted that this is one of the worst failure options, since in most cases the solution to the problem requires a complete repair of the heater. In some cases, swapping the pipes on the radiator helps to cope with blockages. By doing this, you will change the direction of the flow, and the sediment can be washed out of the system. However, it should be understood that the effectiveness of this method depends on the density and severity of the blockage.
Not only the radiator can get dirty, but also the cabin filter, which is another reason that the stove does not heat up. The only way to solve this problem is to replace the clogged filter. Some car enthusiasts simply throw away the damaged part, but it can still come in handy (if a little dust has accumulated in it, you can try to shake it out).
In place of the regular filter, it is better to install a non-original, carbon analogue, which, although it costs less, is still able to protect the interior of the car not only from dust, but also from various foreign odors.
Stove, don't let me down: we keep the heating system in working order
In order for the stove of your car to never let you down and always be in working order, certain preventive measures must be taken. First of all, remember:The radiator needs regular cleaning. The outer part can be cleaned with compressed air, and in case of urgent need, it will be useful to spray it with a stream of water.
The internal radiator is cleaned with a vacuum cleaner, of course, if the pollution is not too significant. Secondly, use only high-quality coolant, since the use of a non-original or low-quality composition is fraught with build-up inside the pipe channels. You can clean the radiator without removing it from the car.
As mentioned above, it is enough just to swap the upper and lower pipes, giving the car a little work. As a cleaning agent, you can use household citric acid or a special flushing liquid. To avoid the recurrence of the problem, experts advise changing antifreeze at least once a year.
Besides, do not forget to change damaged parts in time, in particular, a broken thermostat must be urgently replaced. If it sticks in the open position, the heater will not be able to warm up the interior quickly, which means that the car will warm up longer. Wedging the thermostat in the closed position can cause the vehicle to overheat and result in costly repairs.
Always use a cabin filter, as otherwise all the debris and dust from the street will fall directly into the cabin. If you notice that the flow of hot air from the stove has become very weak, this indicates a clogged cabin filter and the need to replace it.
You should also pay attention to the control levers for the dampers of the heater itself. If the cable or the tap of the stove jumped off, this will adversely affect the operation of the entire system. It is also necessary to periodically lubricate the bearings of the heater fan and clean it from dust. By following all the above recommendations, you will not often have to ask yourself the question “why can the stove in the car not work?”.
Do you know?For a comfortable stay of the driver in the car, as well as for the normal functioning of the car itself, the temperature in the cabin at -25°C outside should be at least +16°C.
