Pacific Automotive Network 1. After raising the temperature, the air coming out of the air outlet is still not hot. 2. The heater cannot be turned off. After lowering the temperature, hot air still comes out of the air outlet. 3. When the air conditioner is turned on in the automatic mode, the temperature inside the car cannot achieve the constant temperature effect.
The symptoms of a broken heater water valve in the BMW It's still hot air; when the air conditioner is turned on in the automatic mode, the temperature inside the car cannot achieve the constant temperature effect.
The working principle of the heater valve: The heater water valve is the heater switch of the car heater. The working principle of the car heater's warm air is that the radiator in the heater is connected to the engine circulating water through the inlet/outlet pipeline. The water valve is a switch: when the water valve is opened, the water path is connected, and the engine circulating water enters the radiator, and the fan Blow heat into the cab; otherwise, the water valve is closed and the warm air does not work.
Heat air valve maintenance tips:
1. In seasons when the weather is not cold, you can close the heater water inlet valve to isolate the engine cooling system from the heater valve.
2. In the cold winter, before using the heater, check whether the left and right air supply pipes and the inlet and outlet hoses are loose, falling off, or cracked.
3. Check whether the heating system is vibrating abnormally, whether the pipeline is leaking, whether the water level in the drain tank is normal, and whether the drain pump is working properly.
4. The water temperature of the engine should not exceed 90°C to ensure the best performance of the heater device.
(Pictures/Text/Photos: Pacific Automotive Network Question and Answer Calling the Beast)