I need to know where the cooling fan control is located. We think this is the problem -- my cooling fan doesn't come on...
There is a relay in the junction box under the hood if the cooling fan is not coming on when the engine is at 180 degress you can take the a/c clutch relay and switch it with the fan relay. if the fans come on it's the relay if it still doesn't it's the temp sensor on the fan unit....please rate this
SOURCE: Cooling Fan Control
The cooling fan control module is located in front of the radiator. It should have 3 wiring harness's coming off of it.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jonathan_3a3c556b4b17d1d2
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A/C refrigerant pressure exceeds 1 310 kPa (190 psi).
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After the vehicle is shut off if the engine coolant temperature at key-off 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 BCM and PCM/ECM command High Speed Fans on under the following conditions:
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Engine coolant temperature reaches 110?°C (230?°F).
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A/C refrigerant pressure exceeds 1 655 kPa (240 psi).
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When certain DTCs set.
The three relays are located in the under hood fuse / relay box ! You need to have it checked for DTC'S -diagnostic trouble codes ! An you need a GM Tech 2 scan tool !
This diagnostic procedure supports the following DTCs:
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DTC P0480 Cooling Fan 1 Relay Control Circuit
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DTC P0481 Cooling Fan 2 and 3 or S/P Relay Control Circuit
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DTC P0691 Cooling Fan 1 Relay Control Circuit Low Voltage
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DTC P0692 Cooling Fan 1 Relay Control Circuit High Voltage
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DTC P0693 Cooling Fan 2 and 3 or S/P Relay Control Circuit Low Voltage
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DTC P0694 Cooling Fan 2 and 3 or S/P Relay Control Circuit High Voltage
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A/C refrigerant pressure exceeds 1310 kPa (190 psi).
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A/C is requested and vehicle speed is below 100 km/h (62 mph) with A/C pressure above 1413 kPa (205 psi).
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Vehicle speed is less than 8 km/h (5 mph) for more than 750 seconds. The fan will turn off when vehicle speed is greater than 8 km/h (5 mph) for more than 20 seconds.
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