Can control direction ,fan turn on a\/c have took out electronic control to turn knob that turn heat to a\/c manually but constantly blows heat even on a\/cRelated Questions99 blazer transmission codeHave code p1870 transmission slip code is there a cheap fix?Air Conditioning blows hotMy Air Conditioning is blowing warm. What could be the problem? I have a 2006 Chevy Truck with 5.3L engine. It has climate control.2003 Chevy BlazerMy windows are constantly fogging up. My heater and AC both work. This has been going on for a while but seems to be getting worse. Could it be the heater core?