Mercedes-Benz W204 heater blower not working

The most common cause is the blower motor: the brushes wear out, the bearing wears or the fan wheel warps. Replacing the motor usually fixes the fault. The resistor packs also fail, and they often burn out precisely because a seizing motor draws too much current.

1. Remove the glove box from its screws and pull it out a little. 2. Disconnect the blower plug and wire. 3. Release the lock by pressing the mark down and turning about 3 cm counterclockwise. 4. Swing the unit out. When ordering a new one, check the connector: with the wrong connector the blower runs only briefly.

Sometimes. The worn brushes and dust can be checked and cleaned with compressed air, and synthetic spray oil can be added to the bearings, after which the motor runs quietly again. If the motor is stiff, replace it so that the resistor pack does not burn out.