Time reading: 3 min

In the summer, few of us turn on the stove for heating, but with the onset of the cold season, an idle stove becomes an unpleasant surprise for the car owner. In such a case, it is necessary to determine the cause of the existing malfunctions and repair the car. Let’s talk in more detail about why the stove may not heat up.


One of the reasons why there are problems in the operation of the stove is the insufficient level of antifreeze in the system. This, in particular, was constantly encountered in the past, when cars did not yet have special coolant level sensors in the system. At the same time, even today it will not be superfluous to check such a coolant, and it is best to do this on a cold engine, and the check itself will take no more than 30 seconds.

There may be a sufficient level of antifreeze in the cooling system, but at the same time, due to the existing air lock, the movement of the coolant stops, respectively, the stove does not heat the interior, and the engine itself quickly overheats. This is extremely dangerous, as the temperature of the engine rises sharply, which can lead to critical malfunctions.


Another common cause of problems with the stove is a failed fan. In such a case, warm air does not enter the car interior, which causes a lot of inconvenience in the cold season. Diagnosing fan malfunctions is not difficult, and the cause of such breakdowns can be electronics, as well as the fan itself, which wears out and is damaged. It will also not be superfluous to check the fuse box when the fan is not working, often such fuses blow out from loads, which leads to problems with the stove.

The stove in modern cars has its own radiator, through which antifreeze circulates from the cooling system. If the stove radiator is clogged, which is often found on older cars, then in such a case, the coolant heated in the engine does not enter the fan, and, consequently, the stove does not heat the car. Certain difficulties in diagnosing such malfunctions are the fact that the stove radiator is often located in hard-to-reach places and it is often impossible to get to it without disassembling the dashboard.

Another common cause of malfunctions is a failed thermostat. Such a mechanical valve is responsible for blocking the movement of the coolant, which is directed in a large and small circle. Due to wear, the thermostat gets stuck in one of the positions, which leads to problems with heating the engine and failure of the stove. Thermostat diagnostics can be performed mechanically when it is removed from the car and checked to see if it opens when the fluid is heated. You can also use the appropriate computer diagnostic equipment on modern cars, which allows you to accurately determine the existing faults.



The stove may not cool the car engine if the head gasket of the engine blocks is blown. In such a case, part of the coolant enters the combustion chamber and exits with exhaust gases, there is less and less antifreeze in the system, so it is not enough for the stove to work properly. Unfortunately, such breakdowns lead to the need for expensive repairs, and these are significant costs for the car owner.

The water pump, which is responsible for pressurizing antifreeze in the cooling system, may fail. It is possible to determine such breakdowns of the pump both by its visual inspection and by using computer diagnostics. For modern cars, the cost of such water pumps can be quite large, and such costs unpleasantly surprise car owners.

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