When the engine is switched off, the circulation of the coolant stops, which can lead to overheating. An electric water pump helps to avoid this situation, which continues to pump coolant through the circuit if the engine temperature was high at the time of shutdown. At an engine temperature of approximately 115°C, the electric water pump is switched on by the corresponding thermal switch, which is installed on the cylinder head (see arrows in illustrations 13.0 and 13.0a).
The thermal switch turns off the pump at a temperature of about 110°C. The electric water pump only works when the engine is off. The pump receives information about this through the D + terminal of the generator, which is de-energized when the engine is turned off. As a result, the electric water pump relay pulls in the appropriate contact and directs current through the circuit from the auxiliary fuse to the thermal switch.
Visitor comments