The fan motor operates at four speeds, set with a front panel knob. The change in speed is achieved by connecting resistances of various sizes. Resistors are connected to the fan motor by wire "masses", and the positive voltage wire remains constant, i.e. only contact with the mass "getting better" or "getting worse".
If the fan does not work in any position of the switch, you must first check the corresponding fuse.
If, despite a good fuse, the wiper does not work, then a malfunction in the unloading contact relay "X".
Check the fan motor: remove the motor plug and connect the auxiliary wires to the freed contacts and further: from "pluses" AB - to the contact of the black / blue wire, from "minus" - to the contact of the red / brown wire.
If the motor is OK, it should rotate at maximum speed. If not, replace the motor.
If the engine does not run at all speeds, then the additional resistors may be faulty.
Remove resistances and visually inspect them. If one of the resistors is burned out, replace the entire assembly.
If the resistances are good, it remains to check the wiring or switches - replace the faulty ones.
Visitor comments