Question about 2004 GMC Envoy

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2004 Envoy XUV - Causing me to be a Human Thermostat. My heat cycles between cold and hot air. When I set the temp to say 73 degs, the air will blow warm for a bit (like it should), then it will start to blow real cold (when it shouldn't) - cooling my feet - causing me to turn up the temp - which then gets way too warm - causing me to lower the temp, on and on. I have to keep changing the temp to keep it comfortable. It never did this before. I did replace the battery prior to the winter but not sure if that was when it started. Any ideas?

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  • ijs12fly Apr 20, 2009

    Thanks for the reply hotchevy1965. At the same time I also have an issue with the air not reaching the front vents, only comes out at feet and defrost. Some research is telling me that the vent issue is related to the actuators losing calibration when I changed the battery. Could the Hot/Cold cycle issue be related to actuators and not temp sensors? My thought is the temp sensors tell the system when to change an actuator, but if the actuators are not calibrated correclty then it may be over controlling causing the problem I have.

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Your vechicle has several temperature sensors you have a lower left and right lower temperature sensors .they are in dash.this is a dealership job.

Posted on Apr 20, 2009

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