Question about 1996 GMC Suburban

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Temp Gage shoots up and down

I have a 1996 GMC Suburban. The past week or two temperature gage seems to be malfunctioning. After only about 5 minutes of driving the temp gage will shoot up and then shoot back down. It will shoot up to the red zone, stay there for a minute or so and then rocket back down to below normal. Even though the gage shoots into the red zone, the truck never over heats. Never hear any hissing, never see steam and seems to perform just fine. We used to pull over when it got to the red zone but now we just drive through it because it always comes back down without incident.

Any ideas?

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POSSIBLY A FAULTY THERMOSTAT

Posted on Dec 28, 2008

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