Camaro Z28 V8-305 5.0L VIN F FI (1991)
Radiator Cooling Fan Motor Relay: Description and Operation
A/C Pressure Fan Switch And Cooling Fan Wiring Diagram
The electric cooling fan is used for both the cooling system and the A/C condenser. The fan is controlled by the ECM. The ECM will ground the
cooling fan relay, which turns "ON" the fan when the following conditions are met.
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Coolant temperature sensor signal indicating a temperature greater than 106°C (223°F).
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A/C head pressure greater than 200 psi and vehicle speed less than 40 mph.
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When the cooling fan is turned "ON" it will stay "ON" for a minimum of 15 seconds.
