Blowing extremely cold air (single digits) until it. Blows good and cold at idle.62 degrees As soon as you start driving down the rd.its starts warming up.82 degrees.i cleaned evaporator install new cabin filter.checked freon and that was good.recirculation door works properly.cleaned bugs out from c. Mack truck evaporator removal procedure explained evaporator leaks and clogged drain lines commonly cause hvac inefficiency in mack truck cabins To remove the evaporator, first disconnect the battery and evacuate refrigerant safely Access the evaporator by removing the dashboard or hvac housing.
Either you don't have enough air flow over the evaporator , or you have heat leaking into the system (duct work) Over charging a system will reduce the effective area of the condenser, and raise the pressure causing more heat in the refrigerant that can't be shed by the reduced effective area of the condenser! 1 now viewing page 1 [50 messages per page] Looking at you post i was before considering how an undercharged system would make the compressor cycle to much Will and overcharged system make the compressor cycle to much, also will overcharged system freeze up the evaporator I was told the clutch cycles to prevent the evaporator from freezing up, i do not know if this is true.
My dads mack dump truck seems to be leaking all of the refrigerant out of the ac system He said the ac stopped blowing cold one day, recharged the system, but the next day it was all hot air again He said he couldn't see the leak so he thought it was the evaporator and replaced that.
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