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I had a similar problem in my 2003 Chevy Cavalier. Right after we purchased the car the temperature gauge frequently went into the red zone with no physical signs of overheating. Eventually the gauge went crazy and would jam the speedometer and so forth. I got to the point where I took the dash apart and installed another gauge cluster bought on ebay for $40 better than the over $250 expect to pay from GM. Never had that problem again. I would recommend changing the gauge cluster since i have seen that cluster defective in many of these cars. FYI my fuel pump failed at about 60k miles on it very frustrating so yeah something else to watch for.Report it
The reason the gauge went bad is because of the stepper motors (the tiny things that power each gauge) that Chevy put in all of their model/makes in 2005 were faulty parts. These are what need to be replaced. My step dad helped me replace these in the instrument cluster (the parts are cheap little things). It's not the gas tank sensor. Your speedometer and tachometer will eventually bo bad, too, and it's their stepper motors. The fuel pump of mine also had to be replaced at around 125k miles. All else has been golden, though the struts have needed replacing for awhile now.Report it
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