Audi a6 heater is not hot. Why?

There are two possibilities: one is caused by the engine cooling system; Second, the control mechanism of warm air is not easy to use. Discrimination method: check the temperature of two water inlet pipes of the lower warm air small water tank. If both pipes are hot enough, it is a problem with the air volume control mechanism; On the other hand, if both water pipes are cold, or one is hot and the other is cold, there is something wrong with the cooling system.

Audi car heater is not hot (1). Check the connecting pipeline and radiator water tank: if it is blocked, it should be dredged and cleaned; When it is difficult to dredge and clean to normal, replace the pipeline or radiator water tank. (2) Check the water pipe and reset it if it falls off. (3) Check the fan. If the fan speed is too low or the air door does not return, repair the fan resistance block or adjust the air door to return. Check the fan motor. If it doesn't work, check its circuit and motor.