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
Any suggestions on what I should attempt first
Thanks