How does the BMW 325i warm air ring?

When the car turns on the warm air, the noise of the blower is mostly caused by poor lubrication of the bearing, or it may be caused by foreign objects in the blower. If the bearing of the blower is poorly lubricated for a long time, just add some lubricating oil or grease to the bearing. If the bearing is damaged, just replace it with a new one. If there is foreign matter in the blower, it can only be solved by removing the foreign matter in the blower.

Car air conditioners basically have blowers, and the role of blowers is very important:

When the air conditioner is heating, the high-temperature antifreeze in the engine will flow through the warm air tank, and there is a blower behind the warm air tank to let the air conditioner outlet blow out warm air. During refrigeration, the compressor continuously compresses the refrigerant and sends it to the evaporation box, which can cool the evaporation box, and the evaporation box can also cool the air blown out by the blower, so that the air conditioner outlet can blow out cold air.

If there is no blower, then the air conditioner outlet will not blow the wind. The blower cannot be replaced until it is damaged. The structure of the blower is very simple, just a motor and a blade. The owner can understand the blower as a household electric fan. The air conditioning system should be cleaned and disinfected at least once a year, which is beneficial to the health of the members in the car.