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A/C not working


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Hi everyone, I have 05 Mack CXN613 and A/C quit working, after I check all fuses notice that APADS lights not coming on at all so I'm not sure how to check that component because green wire is powered when I turn A/C on is there something I'm missing, also I don't have fuse guide in my outer fusebox cover and not sure what fuse is for what, if anybody knows plz let me know it's hot in this cab ūüė©

Edited by megatron
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1 hour ago, Macktech689 said:

Voltage to the APADS also comes from fuse 41 ( 15a )  down the red wire, but before it gets there it runs through the Freon  high pressure switch connector. Also check the APADS ground.

I'm sure there is no voltage in red wire

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Look like the problem is somewhere between fuse and conector to A/C system. I checked everything around that I can see. Now I have yellow light on with 4-2 message and I know that's fan output. If it's not somewhere in harness than don't know where else to look. I run another wire to power APADS and it's start working normally, but 4-2 didn't go away so I hope I'm wrong, as I see the problem is hiding in the harness, where...?? God know. I'm on the road now and don't have tools to trace problem, or you have better idea ūüí°¬†

Edited by megatron
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  • 11 months later...

I have a 2006 MN mack granite quad.  The A/C quit working all fuses are good new switch was just replaced the dealership said some box in the dash is bad $1400.00 to replace it plus 10 hours of labor to do it,???? That about the amount of to switch an engine !@@?,"

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  • 2 weeks later...

I have a 2015 Mack Granite AC system was just fixed two weeks ago the AC keeps kicking on and off on the dashboard it will work for a little while then it will quit sometimes if you mess with the relay it kicks back on I tried replacing the relay now it's not working at all any ideas

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Have you checked that the Compressor Clutch is engaging?

also have you looked in the sight glass on the receiver dryer for bubbles...?? 

  • Like 1

"Be who you are and say what you feel...
Because those that matter...
don't mind...
And those that mind....
don't matter." -

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I bet his compressor clutch is the type you can't see..  they started that crap 10+ years ago..  it turned a quick inspection into a half day event... :)

Edited by Joey Mack
Poor sperring
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