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Heater controls changing

ElyDuckMan

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ElyDuckMan New Member

ElyDuckMan

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Hi All

I have a 2007 GMC Sierra new body style and when I have the heater on it might blow on my feet like I have it set to do but then out of the blue it will change to the body vents and the fan speed will also change on its own. Any idea why this might happen and how to fix it?

Thanks

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