Radiator Cooling Fan: Description and Operation

System Outline

The radiator fan motor and 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/off, 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.