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?


the heater core is failing or u dont have enough fluid--driving is takin the temp down--replace blower motor and ac evaporator when u change it since it a major job

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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)


Thanks, Terry

Mar 14, 2014 | BMW Cars & Trucks

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In cold weather heater will not blow warm air unless at idle stopped. when at highway speed blows cold air


check and make sure the radiator is full of antifreeze take off the radiator cap and top off the radiator then take your hand and cover the hole where the cap goes and squeeze the top radiator hose a few times to help it go down that way if there is a air pocket somewhere it will help push it out when you thank your done top off again and replace the cap and try

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Air pockets in radiator


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.

Jan 15, 2013 | 2008 Nissan Frontier

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Engine suddenly over heated, no hot heating in car


most newer car use shut down as a safety feature whenever the temp gets really hot it turns off to save the motor. check your fans if they turn on if they do you might have a bad thermostat.

Sep 19, 2012 | Ford Cars & Trucks

1 Answer

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


check your thermostat and upper and lower hoses when your idling to see if coolant is passing through your engine

Jan 25, 2010 | 2006 Lexus Is 250

1 Answer

2002 audi a4 1.8t heat problem.


most likely a air bubble in your system. get it up to temp open up your reservoir use something that will fit in the opening and put coolant into it rev engine up a bit until you see bubbles coming up. when you did the engine did you replace cooling system parts like t-stat or water pump? purging the system of air will take a little while good luck hope that helps

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My ac only works part of the time


u have a temp door accuator motor shorting out

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