harry771

Can anyone tell me where the sensor for the cooling fan is locate? Any response would be greatly appreciated.

xeroinfinity

Welcome to AF.

thier is not a sensor for the fans realy.
It reads coolant temps from the sending unit in the thermostat housing.

Thier is also two relays under the hood in the fuse box.
And a couple fuses.

Fan operations are as follows....
The PCM commands Low Speed Fans ON under the following conditions:

The engine coolant temperature exceeds approximately 106°C (223°F).
The A/C refrigerant pressure exceeds 1310 kPa (190 psi).
The vehicle is shut off when the engine coolant temperature is greater than 140°C (284°F) and system voltage is more than 12 volts. The fans will stay ON for approximately 3 minutes.

The PCM commands High Speed Fans on under the following conditions:

The engine coolant temperature reaches 110°C (230°F).
The A/C refrigerant pressure exceeds 1655 kPa (240 psi).
When certain DTCs set.

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1999 Grand Am SS 3.4 OHV

harry771

Thanks