The air conditioner is cold, but the car is still very hot.

The air conditioner is cold, but the car is still hot because the original temperature sensor is faulty. Solution: After replacing the indoor pipeline temperature sensor, everything is normal after debugging.

When the air conditioner is used for heating, due to the function of preventing cold air, the indoor fan works with breeze when the indoor heat exchanger of the indoor temperature sensor reaches above 25 degrees Celsius, and works at a set wind speed when the temperature reaches above 38 degrees Celsius. For the above faults, firstly, it is observed that the wind speed is low and the outlet air temperature is high. Check whether the fan is normal.

Automobile air conditioning warm air heat source;

It is provided by engine coolant, that is, "water" in the water tank. Two water pipes are led out from the small circulation loop of engine coolant and connected to the warm air box inside the air conditioning assembly (generally in the lower part of the center of the instrument panel, no water drops can be seen without disassembling the instrument panel). This small water tank provides heat source for the air conditioning heating system. Even in summer, there will be more than 90 degrees of coolant passing through this small warm air tank.

Knowing where the warm air comes from, it can be concluded that using air-conditioned warm air in winter will neither affect power nor increase fuel consumption. The air conditioner switch controls the compressor for refrigeration, so turning on the air conditioner in winter will not increase the power of the warm air, but will waste the compressor to do useless work.