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 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, engine control module and/or a/c control assembly, the radiator fan motor operate and a/c condenser fan motor operates at high speed.