Question about 2005 GMC Sierra Denali

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I changed the termostat on my 2005 gmc sierra and now it overheated please help

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Thermostat is possibly installed wrong/backwards, defective, or you have a large air bubble in the engine. After you changed the therm you must run the heater ( fan on low) to help purge extra air. Hope this helps. Good Luck

Posted on Aug 13, 2010

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Posted on Jan 02, 2017

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