Question about 1995 GMC Sierra

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I have a 1995 GMC Sierra 500, the heat only blows hot when the truck is idling, when you get up to say 30 mph or 35 mph it will only blow cold air. What could the problem be?

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It sounds like the engines thermostat is stuck open, when you idle the engine has little air over the radiator so the heater will work, but when you are driving lots of air and the engine runs cold. I am sure you just need a new thermostat.

Posted on Jan 25, 2012

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Posted on Jan 02, 2017

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