Grand AM V6-3100 3.1L MFI VIN M (1994)
Radiator Cooling Fan Motor Relay: Description and Operation
The PCM controls engine cooling fan operation through a relay. The fan only operates when needed. The relay get constant battery voltage, and is
energized when the PCM completes the relay coil circuit to ground. The PCM will operate the cooling fan under any of the following conditions:
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A/C is requested and vehicle speed is less than 70 mph (113 km/h).
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Engine coolant temperature is greater than 226°F (108°C) with A/C "ON" or "OFF".
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A/C refrigerant high side pressure greater than 185 psi (1275 kPa).
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PCM is in backup mode.
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Diagnostic trouble code 14, 15 or 70 is set.
