Attention! If the fan does not run on only one stage, the pre-resistor is usually bad. In this case, replace all pre-resistors.
Remove glove compartment, see chapter Body, car painting, car care, Chapter Instrument panel/center console.
Fan motor
1. Disconnect the plug from the fan motor.
2. Apply battery voltage with auxiliary cables (12V) on terminals A (+/ plus) And b (-/ minus).
3. The motor must work, otherwise replace the motor.
Preresistors
1. Disconnect the plug of the resistor board.
2. Check the following terminals for current flow using an ohmmeter: a - b; a - c; a - d. If at least in one case no current flow is detected, the pre-resistors should be replaced. The individual resistance values range from 0.5 ohm to 1.5 ohm.