Question about 1997 Pontiac Bonneville
It may not be a fuse, first thing I think of is the thermostat. It may not be sensing the temperature rising any longer and therefor not turning the fans on. The thermostat is often screwed into the cooling system in at or near the water pump, or the radiator. You can find it by following the wires from the fans. They should lead to the thermostat.
Posted on Mar 05, 2009
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Posted on Jan 02, 2017
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When the A/C is requested and the ambient temperature is more than 50?°C (122?°F).
A/C refrigerant pressure exceeds 1310 kPa (190 psi).
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 PCM commands High Speed Fans on under the following conditions:
Engine coolant temperature reaches 110?°C (230?°F).
A/C refrigerant pressure exceeds 1655 kPa (240 psi).
When certain DTCs set.
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