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I have a 2004 Pontiac Sunfire. My car has recently started to have an increase in temperature (evident by the temperature gauge) during stop and go driving or if the car is left idling. I am not sure what the issue is but I do know that the coolant levels are full and that the I had to have the head gasket replaced approximately 2 years ago. The head gasket blew without any signs (meaning the car never over heated.) When the head gasket was changed then the engine was planed before being reassembled. I am at a complete loss. I was thinking it might be one of the following (but do not want to replace each item with out being needed): fan clutch, air dam/VALACEat, water pump, cooling fan switch, radiator fan motor, or else the thermostat. Any advice would be greatly appreciated. Thank you in advance!
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disconect wire from temp sending unit
if that stops gauge moving , u most likely need to replace sender unit
they are not expensive
if after replacing sender unit gauge still does it, u need to replace the gauge
For 1997 Pontiac Sunfire 2.2L SFI OHV 4cylthe Coolant Temperature Sensor is located under hood, driver side, upper engine area, below valve cover, mounted in cylinder head.
Fig. 1: The ECT is also the temperature sending unit for the gauge on the instrument cluster
check fuses,remove sender unit from tank,connect ohm meter to it and physically move arm up and down slowly and check for increase/decrease in resistance,if this is ok then supply power to the wiring to gauge and see if the needle rises,if no change in resistance sender is rooted,if no change in gauge when it is supplied power then the gauge is rooted,when diagnosing electrical probs always check fuses firstelectrical
On the 03-05 Cavalier instrument clusters this is a common problem, it's caused by failing stepper motors on the cluster's circuit board. It can be repaired though, check out this site for more on how to get it fixed - Cavalier instrument cluster repair
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