Question about 2004 GMC Envoy

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Loss of heat when driving on highway,blows cold air.

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Thermostat is stuck open and requires it ti be replaced

Posted on Dec 30, 2010

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2000vwpassat1.8litre blows cold air when driving I changed the thermostat . if you are running it in the garage it blows lots of heat. what could the problem be?


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Cold Air in highway


If you haven't, check your cooling liquid to see how full the resovoir is, or maybe the thermostadt is sticking (but I doubt that)


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Air can be purged. While your engine is cool remove radiator and reservoir caps. Place funnel in radiator. Turn heat to the highest position and start vehicle. Add coolant to radiator as needed while vehicle warms up. You should see bubbles coming out of radiator. Fill reservoir to between cold and hot fill lines. Replace caps when bubbling stops but before coolant temperature reaches normal operating temperature. Never remove the radiator cap until engine has fully cooled down.

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Heater in my '06 IS250 blows cold air when driving slow or stopped, but heats perfectly when driving at highway speeds.


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