17 Audi A4L heating feng shui valve is dead.

The thermostat is normally turned on or turned on too early, which leads to the large circulation of the cooling system too early, and the impeller of the water pump is damaged or lost, so that the flow through the small warm air water tank is not enough and the heat cannot come up.

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. Take Audi A4L202 1 40TFSI Premium Life Edition as an example: its level is medium-sized car, and its gearbox is 7-speed wet dual clutch.