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07 Chn613 ac issues

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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. Again recharged the system, But again the next day the ac was blowing hot. He used dye and spent hours with his mechanic looking for the leak with no luck. Is it even leaking? Could the compressor be out? Day cab Mack any info would be much appreciated. 

Edited by Erixx0407
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