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PTC heater problem
Electric heater warms the interior quickly in cold weather.
Costs
Every car issue can be caused by different things. Here are the most common ones
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Most Expensive
Moderate costs
Cheapest case
Discussions
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Details
Probability
Based on the values and symptoms you have entered, a crude estimation of the probability of this problem can be made
HIGH
Typical consequences
If this defect is detected, it may lead to the following problems:
- Restriction of driving comfort
Functionality auxiliary heater
Diesel engines do not generate much waste heat, so many manufacturers use electric auxiliary heaters to improve heating performance. This works much like an instantaneous water heater and is installed in series upstream of the heater heat exchanger. Its maximum output varies depending on the vehicle.
Power is usually supplied without a fuse and directly from the generator. There is an additional connection to the engine control unit. The integrated automatic heating/air conditioning system (air conditioning control unit) requests the heating power via the engine control unit. At approx. 0°C the auxiliary heater heats up to 86°C coolant temperature and is switched off earlier at warmer temperatures.