- If the fan does not run in any switch position, immediately check the corresponding fuse in the fuse box.
- If the fuse is OK, then check the fan switch. To do this, dismantle the control unit as described above.
- Check if voltage is applied to the terminals of the multi-pin connector. If it is missing, then check the wiring coming from the fuse box.
- In the next step, check the switch in all positions «for patency». To do this, connect a multimeter.
- A defective switch should be replaced. As experience shows, repairs do not increase the duration of its operation.
- If the switch is OK, then check the ground connection at the fan motor.
- If no defect is found here, then the fan motor is faulty (carbon brushes burned out, armature winding melted).
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