Figure 7-41. Wiring diagram for the heater fan motor and heating elements for the outside mirrors and rear window:
1 - ignition switch;
2 - mounting block;
3 - heater motor switch;
4 - additional resistor;
5 - heater electric motor;
6 - rear window heating element;
7 - outside mirror heating element;
8 - rear window heating switch with indicator lamp;
A - to power sources;
K6 - additional relay;
K7 - rear window heating relay.
An additional resistor is used to obtain different rotation speeds. It is secured with a screw on the left side of the heater radiator casing. The resistor has three spirals and a fuse. When three spirals are connected to the electric motor power supply circuit, the 1st fan rotation speed is provided, if two spirals are connected - the 2nd speed, if one spiral is connected - the 3rd speed. When the electric motor is turned on without a resistor, the fan rotor rotates at the maximum 3rd speed (3000 min⁻¹).
It is recommended to replace a faulty electric motor with a new one. The only possible repair is cleaning the collector. There is no need to remove the electric motor from the car for this. It is enough to remove the water deflector shield, the protective casing of the electric motor, and then the cover of the electric motor with the brush holder.