What's the noise of car heating? How to fix it?

The heater motor is damaged; The solution is as follows: \ x0d \ firstRemove the heater, open the heater shell, and check whether there are foreign objects in the fans on both sides of the motor. If there is a foreign body, it is enough \x0d\ seconds; Turn on the motor to check the power. Whether the bearing clearance on both sides of the machine is too large. I wish it were too big. \x0d\ Third; Check whether there is sweeping and boring phenomenon between rotor and spindle. If there are sweeping and boring phenomena, it is recommended to replace the motor. \x0d\ fourth; In order to maintain the heater motor before use, the motor bearing should be oiled. Clean the water tank of the heater.