Cooling System: Description and Operation

Circuit Description
The engine control module (ECM) or engine/transaxle control module (PCM) controls the operation of the radiator fan and the condenser fan. The control module monitors coolant temperature through engine coolant temperature sensor. The module also monitors A/C operation through the A/C ON input and A/C pressure switch input . Using these inputs, the module will ground the coil of the appropriate relays to provide low speed middle speed and high speed fan operation.