If the electric motor does not work or its anchor rotates slowly, the heater electric motor switch should be checked for operability. The switch is removed from the socket by prying it with a screwdriver blade, and the wires are connected directly without the switch. After confirming the malfunction, the switch is replaced.
If the switch is OK but the motor does not work, it must be removed and the cause of the failure determined. The following possible faults are known:
- sticking or wear of the electric motor brushes, breakage in the armature winding or oxidation of the commutator;
- short circuit to ground of the armature winding. This defect is confirmed by the immediate blowing of the fuse when the heater is turned on;
- armature shaft rubbing in bearings.
In order to remove the heater electric motor, it is necessary to perform several auxiliary operations:
[The article is taken from the website: VAZbook.ru]
- disconnect the ground wires from the battery;
- move and remove the four spring clips and, having disconnected the wires, remove the fan shroud from the radiator;
- release the two spring clips and remove the electric motor from the fan housing.
If it is necessary to clean the anchor collector from oxidation, it is necessary to unscrew the screws of the cover and remove it, and also remove the lock washer from the anchor shaft and remove the anchor from the housing. Clean the collector with fine-grained sandpaper, blow it with compressed air and lubricate it with a thin layer of technical petroleum jelly. The electric motor and heater are assembled in the reverse order of disassembly.