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 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 Share on other sites More sharing options...
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