The BMW heater is not heated.

1. The thermostat is often turned on or turned on too early, leading to a large cycle of the cooling system too early, and the outside temperature is very low, especially when the car is driving, the cold air will soon cool the antifreeze, the engine water temperature will not come up, and the warm air will not be hot;

2. The water pump impeller is damaged or lost, so that the flow through the warm air small water tank is insufficient and the heat cannot come up;

3. There is air resistance in the engine cooling system, which leads to poor circulation of the cooling system, resulting in high water temperature and not hot warm air. If the cooling system ...

4. If the inlet pipe of the small warm air tank is very hot and the outlet pipe is very cold, this situation should be that the small warm air tank is blocked, and the small warm air tank should be replaced.