First, the air conditioning filter element of the vehicle is too dirty or the air conditioning blower enters the sundries and causes abnormal noise. In this case, it is necessary to replace the air conditioning filter in time, and then check the blower. If sundries enter the fan, the fan must be disassembled and thoroughly cleaned.
Secondly, the servo motor of vehicle cold and warm air conversion adjustment is stuck, so it is necessary to check the adjustment motor related to cold and warm air. If there is a problem, it needs to be replaced with a new one.
Third, this phenomenon is caused by the unclean air duct of vehicle air conditioning. In this case, it is necessary to go to the repair shop to thoroughly clean the air conditioning duct!