Mercedes-Benz W202 heater blower whine
C180
Why does the Mercedes-Benz W202 heater blower whine or squeal?
The causes are usually worn or dry bearings in the blower motor and worn brushes. The noise can be louder in frost and change with the speed.
Can the whine be fixed without a new blower?
Often it can. The motor is cleaned with compressed air and the bearings are lubricated with gun oil or CRC, which stops the noise. If the brushes are worn out they can be replaced, but the housing is crimped shut, so the job is harder than just lubrication.
How do I get the blower out of a Mercedes-Benz W202?
The blower is in the front passenger footwell. Remove the lower panel and the fresh air filter, and the blower is visible. Disconnect the electrical connector before opening the motor cover. The motor is held in by a few screws, and the filter is worth replacing if it is full of debris.
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