What if the heating in my old Passat is not hot?

The warm air of the car is blown into the cab by the blower. If the air volume is insufficient or the distribution of cold and hot air is not good, the heat of the warm air tank will not be radiated, and the temperature of the warm air will not come up.

At this time, first check whether the filter element is dirty and blocked, clean it, and replace it in time if necessary; Then check the operation of each gear of the blower, and each gear must reach sufficient speed.

If the knob is set to the warm air position, the air volume is large enough and the wind direction is normal, and the cold air is blown out, check whether the cable of the hot and cold air control flap in the warm air box falls off, whether the warm air impeller is damaged, whether the flap falls off, etc. After troubleshooting, the warm air will get hot.

Extended data:

Warm air comes from the heat generated when the engine is working.

When the cooling system of the engine radiates heat to the engine, the radiated heat is sent into the car through the fan to form warm air; When the warm air is not used, the fan stops running, the hot air port is closed, and the heat emitted will be completely dissipated into the atmosphere. Therefore, the car heater belongs to waste recycling and will not consume oil.

The AC key is the switch of the air conditioner compressor. To use air conditioning in summer, you must turn on the AC button, that is, turn on the air conditioning; The warm air only uses the thermal cycle in the car, and there is no need to start the air conditioning compressor at all. So you just need to adjust the air conditioning button, and you can turn on the heater without turning on the AC switch.