Radiator Cooling Fan: Description and Operation

SYSTEM OUTLINE

The radiator fan motor and A/C condenser fan motor operates according to the water temperature SW No.1, water temperature SW No.2, A/C single pressure SW, 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, or when the water temperature SW No.2 is on, the radiator fan motor and A/C condenser fan motor operates at low speed.

2. HIGH SPEED OPERATION
Either when the A/C system is operating, or when the water temperature SW No.2 is on, if the water temperature SW No.1 or A/C single pressure SW is on, the radiator fan motor and A/C condenser fan motor operates at high speed.