Want this question answered?
bad relay or temp sending unit
The radiator fan sensor switch or the radiator fan motor are at fault (maybe even both). Wire the fan motor direct to see if it will run, if it does, replace the sensor switch. If the fan motor doesn't run, replace the fan motor before you buy a new sensor. If after replacing the fan motor, the fan still doesn't run, then replace the sensor.
Check the fan relay.
Under passenger side by firewall.
heater fan problemI'm haveing the same prblem in my 1997 Bonneville and have been told after paying $80 for the diagnosis by the Pontiac service department that it is the fan motor that needs to be replaced. I believe that there is a sensor of some kind that is attached to the heater fan which has gone bad. I haven't replaced it yet but it cost around $50 to buy the fan so it's an easy fix if what the Pontiac service department said is true. Don't let them do it they will charge you around $250 for the same repair!
You could have a short from the controlls to the fan
the fan relay sensor is out of it.
The 1996 Pontiac Grand Prix cooling fan sensor is located on the front of the engine. The fan sensor can be found just above the thermostat.
Is this a 2003 Pontiac Bonneville? I need this answered for this year and make.
This varies based on engine type. Most are relatively easy to find under the throttle body and connected to two wires.
Depends on if you mean the radiator fan or the inside blower fan. They should be at the back of the engine compartment against the firewall under a plastic cover all in a row.
It is the coolant temp sensor near the upper radiator hose.