Heater Blower Fan Resistor A1408218351 For Mercedes W140

Abnormal sound of automobile blower is usually caused by the following reasons:

1. Wear: Long-term use or poor use environment will lead to the wear of internal parts of the blower, such as bearings, gears and other parts, which will produce friction noise.

2. sundries entering: dust and sundries entering the blower will cause parts to rub or get stuck, resulting in abnormal sound.

3. Bearing failure: Damage or insufficient lubrication of the blower bearing will lead to abnormal sound of the bearing.

4. Blade deformation or damage: The blade may be deformed or damaged after external impact or long-term use, resulting in abnormal noise caused by friction between the blade and the shell.

5. Motor failure: Motor failure or coil short circuit of blower will cause abnormal noise.

6. Installation problem: Unstable installation of blower or loose fixing screws may also cause abnormal sound.

7. Other reasons: problems such as loose internal structure of blower and aging insulation materials may also lead to abnormal sound.

When abnormal sound occurs in the automobile blower, it is necessary to check and find out the cause of the problem in time, and repair or replace parts according to the specific situation to ensure the normal operation of the blower and avoid further damage.