Camaro V8-305 5.0L VIN F FI (1985)
WIRING DIAGRAM
CHART C-12C, FAN RUNS AT ALL TIMES
a. The cooling fan is totally controlled by the ECM based on inputs from the coolant sensor and fan switch. The fan should run if coolant temperature
is greater than 112°C (234°F).
b. Battery voltage is supplied to the fan relay on terminal E and ignition voltage to terminal C.
c. Grounding CKT 335 (relay terminal B) will energize the relay and supply battery voltage to the fan motor.
d. The ECM will remove the ground to CKT 335 if vehicle speed is over 40 MPH/unless the engine is overheating.
e. When A/C is used, the fan control switch mounted in the A/C High Pressure line will open when head pressure exceeds 233 psi (1600 kPa) and
this input causes the ECM to ground circuit 335.
f.
If a code 14 or 15 sets, the ECM will turn on the cooling fan.
g. If the ECM fails to turn on the Fan Relay by grounding CKT 335, the Fan Override switch can complete the circuit.