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Always blowing warm/hot air

2K views 3 replies 2 participants last post by  djlove 
#1 ·
My 2004 gmc sierra 2500hd has digital dual climate controls. It has now being operating for a while with a problem. When the ac is on max and temp dials turned down all the way it blows out warm/hot air. When I turn the ac off and just have the heat turned to very low it only wants to blow out the hot air nothing Cool

Any suggestions on what I should attempt first

Thanks
 
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