Stingray698 Posted May 11, 2011 Share Posted May 11, 2011 Ive been working a a mack granite the ac will work when the blend is on the defrost position only , the local mack dealer said there is another micro switch on the fan switch behind the hvac controls i couldnt find it am i missing something , truck does not have the diagnostic ac function either , i understand the blower needs to move air through evaporator so it doesnt freeze up but i just cant figure out why the ac wont work on vent or floor or any of the other posistions , any guidance would be appreciated , thanks Quote Link to comment https://www.bigmacktrucks.com/topic/19027-2007-mack-granite-ac-problem/ Share on other sites More sharing options...
adr Posted May 18, 2011 Share Posted May 18, 2011 Ive been working a a mack granite the ac will work when the blend is on the defrost position only , the local mack dealer said there is another micro switch on the fan switch behind the hvac controls i couldnt find it am i missing something , truck does not have the diagnostic ac function either , i understand the blower needs to move air through evaporator so it doesnt freeze up but i just cant figure out why the ac wont work on vent or floor or any of the other posistions , any guidance would be appreciated , thanksthere are 2 actuators on the blend box that controls the air flow.. we replace a ton of the blend boxes at my dealership.. you can replace the actuator but might be better off replacing the blend box. Quote Link to comment https://www.bigmacktrucks.com/topic/19027-2007-mack-granite-ac-problem/#findComment-77986 Share on other sites More sharing options...
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