The fan speed is changed by connecting resistors with different resistance (or by turning them on one by one). Resistors are connected to the wire leading to the case («mass»), to the fan motor. Current supply (through the fuse), thus remains constant «getting better» or «getting worse» contact only «mass».
Fan Motor Troubleshooting
If the fan does not work at any switch position, you should first check the corresponding fuse (tables in chapter «Body electrical system»).
If, despite a good fuse, the wipers do not work either, then the cause is in the unloading relay of contact X (see chapter «Body electrical system»).
Checking the fan motor: open the waterproof cover at the rear in the engine compartment.
Disconnect the two-pole plug from the fan motor, lay the auxiliary wires to the two freed connecting contacts: from the positive battery terminal to the contact where the blue-red wire was, from the negative battery terminal to the contact where the brown-red wire was.
If the fan motor is OK, it should run at maximum speed. Otherwise, replace.
If the fan does not run at all speeds, then one of the resistances may be faulty.
Remove additional resistances, conduct a visual check. If one of the resistors is burnt out, it is necessary to replace the entire block of resistors.
If the additional resistances are in order, then along with a broken wiring, the rotary knob on the dashboard may be the cause of the malfunction - completely replace the heating drive.
Left: additional resistance board (2) disconnected from fan housing (1) (arrow). The photo shows a water radiator with the protective coating removed.
Right: The heating/ventilation control unit is removed here. At the same time, the operation of the fan switch is checked (1), as well as temperature control drives (2) and the amount of air supplied (3).
Removing the interior blower motor
The interior fan motor is balanced together with the impeller, so only both parts can be replaced as a set.
Completely remove the watertight housing cover at the rear of the engine compartment.
Where present, remove the dust filter.
Remove the connecting cable plug.
Remove the air duct with shut-off valve.
Protective ring, lock washer and shell on the opposite side of the heater body (at the height of the central axis of the fan motor) take off.
Turn the engine to the right in the heater housing and remove it.
Removing resistors
Remove the waterproof cover at the rear of the engine compartment.
Remove the Phillips screws under the resistor frame (where there are).
Pull the frame down from the heater housing.
When installing, make sure that the frame sits really tightly in the duct.
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