Why is my car heater not working

Have the car heater checked

Defective car heater - when there is no more hot air

What happens if the heater in the car does not warm up? If the heater in the car is defective, a too low temperature inside is initially only a comfort problem. In wintry weather conditions, the lack of a view through the steamed-up windows is often much more important. The combination of darkness and increased risk of dazzling represents a significant potential hazard. If the heating in the car no longer warms up, there are various possible causes. Where exactly the problem lies can only be determined by the workshop after troubleshooting and precise analysis. At FairGarage you will find workshops in your area that will thoroughly check the heating of your car and make it functional again.

Tasks and functions of the heater in the car

Not much needs to be said about the role of car heating. If necessary - especially in the cold season - the heating in the car ensures a pleasant climate in the passenger compartment. In addition to this practical aspect, the car heater also fulfills safety-related tasks by protecting the vehicle windows from fogging and being able to free them from frost or ice in a short time. The function is simple. The waste heat from the engine is conducted into the vehicle interior via the heat exchanger and distributed there by the fan.

Possible sources of error for the lack of heating effect

The experts in the specialist workshops that can be found on FairGarage know the possible causes of a defect. You will therefore also know how to carry out a diagnosis of the heating system in the car. First, the professional checks whether the defect only relates to the passenger compartment or also to the engine. A poor heating effect or a complete lack of heat, so that only cold air blows out of the heater, often indicates a problem with the thermostat of the cooling system. If the coolant level is too low, problems can also arise.

When the heat exchanger is defective

If the engine temperature is within the normal range, which can be read on the coolant temperature display in the instrument panel, without the passenger compartment heating up, the car's heat exchanger is usually defective. The heat exchanger is either blocked or leaking. Leaks on or in the heat exchanger are difficult to discover, which is why this should always be left to a specialist. In exceptional cases it is possible to repair the defective heat exchanger, but changing it is usually the more sustainable alternative.

Other possible defects in the car heater

Less serious problems are also conceivable if the car does not warm up. If the car heater does not work correctly, the cable to the heater flap could also be torn or a servomotor could be broken. The fan motor can also fail, which can be determined from a corresponding switching noise. If such a switching noise is completely absent, the workshop often finds the fault in the fuse box, because then the circuit cannot be closed because of a defective fuse.

With a defect in the car heater in the workshop

The fact that the car heater does not get warm and the air in the passenger compartment stays cold can have many different causes. Fuses, cables, coolants, heat exchangers, blower motors, leaky or clogged entrances - this range of options requires a great deal of expertise in order to quickly and accurately track down faults in the car. This is everyday business for the competent specialist workshops listed at Fairgarage.

Systematic troubleshooting in the workshop

Many such repairs can be minimized if the driver immediately visits a workshop if the heating effect is insufficient or absent and the corresponding symptoms occur. There, before repairing the heating or changing defective parts, the specialists have a diagnostic strategy that is worked through piece by piece in order to find the fault. If there is no heating output in the car heater, troubleshooting is usually carried out from the smallest to the largest cause.

Further search for the defect

After checking the fuses, the coolant level is corrected if necessary. If the problem persists, it will look for leaky, porous, or clogged areas. The last “troublemaker” could then only be the cable, the defective fan or the fan motor, the leaky or defective heat exchanger or the thermostat. In modern vehicles, an electronic system can also cause the malfunction.

This is how the costs are composed

Due to the potential sources of error, the costs for a workshop appointment can be very different. In addition, there are other cost factors such as the type of workshop, the vehicle model, the region and possible other spare or small parts. In the case of minor damage (fuse, coolant, cable, etc.), the labor costs are the larger part of the bill. In the event of major damage (e.g. the defective fan or the thermostat), the proportionate price for original parts can increase to up to 50 percent of the total costs. However, these are rough guidelines.

Simply ask one of the workshops in your area listed on FairGarage for an appointment to check your defective car heater or arrange a repair appointment online.