Question about 1997 GMC Sierra

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Tempeture gage goes up and down and less heat

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You may have a weak water pump, bad thermostat, or an air locked system. Flushing the system is the best remedy first to pin point things.Then test the thermostat by taking it out and putting it in a pot of boiling water. If the thermostat opens, it is ok, if it doesn't it's bad. Let me know if this helps, and after you try that, if it doesnt work we can run further tests let me know

Posted on Jan 18, 2013

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