Chevrolet Workshop Manuals
Caprice Wagon V8-350 5.7L (1994)
Relays and Modules > Relays and Modules - Cooling System > Radiator Cooling Fan Motor Relay > Component Information > Description and Operation > Primary Cooling Fan Relay > Page 127
Radiator Cooling Fan Motor Relay: Description and Operation
Cooling Fan Relay Circuit.
The PCM controls the ground path for the cooling fan relay and is used to control the high current flow to power fan motor. The PCM determines
The PCM will activate the secondary cooling fan when any of the following conditions exist at idle:
^ Certain PCM diagnostic trouble codes are set
When the secondary fan has been turned "ON" by the Engine Coolant Temperature (ECT) Sensor the PCM will turn the fan "OFF" when that
The secondary cooling fan relay is located in the underhood electrical center.
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