System Outline

The radiator fan motor and A/C condenser fan motor operate according to the water temp. SW (Inverter), A/C single pressure SW, engine coolant temp. 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 

   When the water temp. SW (Inverter) is on and/or the A/C control assembly is in operation, the radiator fan motor and A/C condenser fan motor operate at low speed.

2. High Speed Operation 

   When the pressure SW (Single) is on, and the engine control module and/or the A/C control assembly is in operation, the radiator fan motor activates and the A/C condenser fan motor operates at high speed.