Removal and installation
For easier access, remove the ignition distributor and air cleaner intake pipe.
Disconnect the connector from the motor thermal switch.
Drain the liquid from the cooling system to a level corresponding to the lower edge of the upper radiator hose. To do this, unscrew the drain plug located at the bottom of the radiator.
Loosen the clamp and remove the upper radiator hose.
Turn out bolts and remove the fan electric motor in gathering with the directing casing.
Installation is carried out in the reverse order of removal, taking into account the following.
Add antifreeze to the cooling system, connect the wire to the negative terminal of the battery and check that the fan turns on when the engine warms up.
Checking and repairing the radiator fan
Pic. 5.4. Radiator fan switching circuit: A - electric motor; B - contact connector; C - intermediate relay; D - thermal switch; E - ignition switch
The cooling system fan consists of an electric motor and an impeller mounted on a guide casing, which is bolted to the radiator; relay for turning on the fan, mounted on the left inner mudguard, and the thermal switch screwed into the thermostat housing (pic. 5.4).
When the temperature rises to the threshold value (97°С) the thermal switch contacts open and the fan motor is switched on through an intermediate relay. When the temperature drops to 90°C, the thermal switch contacts close and the electric motor turns off. The relay contacts are normally closed, i.e. To turn off the motor, a current must flow through the winding of the intermediate relay.