GMC Tempature Guage issue?

GMC Tempature Guage issue?


GMC Tempature Guage issue?

Posted: 17 Jan 2012 05:37 AM PST

Ok so I have a 2004 GMC Sierra with the 4.8 engine and it's 4wd. Here is the problem. I just replaced the thermostat 2 weeks ago and now my temp guage goes 3/4 of the way up towards the hot end really fast in the am but its not blowing warm heat and I live in Maine so I know its not that warm yet. Then it finally blows warm heat but when I slow the truck truck down the temp guage goes down to the middle where I think it should be but there is no heat it goes cold. Then I give it some gas the temp guage goes high again and theres heat. So messed up.

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