Radiator Cooling Fan: Description and Operation

SYSTEM OUTLINE

The radiator fan motor and A/C condenser fan motor operates according to the engine coolant temp. SW, A/C single pressure SW, the engine system condition, and the A/C system condition. The FAN NO.1 relay, FAN NO.2 relay, FAN NO.3 relay are turned on, to operate the fan motors at low speed (In series), or high speed (In parallel).

1. LOW SPEED OPERATION
Either when the A/C system is operating, the radiator fan motor and A/C condenser fan motor operates at low speed.

2. HIGH SPEED OPERATION
When either the engine coolant temp. SW or A/C single pressure SW is, or both of them are turned on, the radiator fan motor and A/C condenser fan motor operate at high speed.