Question about 2000 GMC New Sierra 1500

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2004 GMC Sierra Heater does not heat on low RPM

The heater will blow only unheated air at idle or until I actually apply at least 1600rpm on the engine. It will heat just fine then. On the road it heats and if I slow or come to a stop, the cold air starts again until I reach 1600rpm. Engine temperature gauge appears to be working normally and does not fluctuate when the heater temp fluctuates.

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Check your coolant level on the radiator

Posted on Feb 03, 2009

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Blows cold air turn heat on


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1989 GMC Sierra 1500 heater blows cold air. Changed thermostat. Both hoses are cold.


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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?


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.

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2005 GMC Sierra heater blowers work fine but only blows cold air until you start into a good continuous acceleration. It blows cold though no matter how long the truck sits idle after cranking. Never done...


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2005 GMC Sierra 1500 - heater blows, but only cold air


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A/C and Heater will not blow air..


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check dial switch, check valve that lets water run through heater core

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