Hey guys gotta question for ya. 03 peterbilt 379, I just had the whole AC system replaced. Compressor, accumulator, lines, expansion valves and everything for the bunk AC also. Now my problem is, at idle or 900-1000 rpms The AC blows 45 degs but when I take off rolling down the highway the AC blows about 58degs. Now my pressures are fine and freon is right on the money according to the machine. I'm kinda just lost here on this issue. The AC never had this problem for 6yrs until the old compressor blew the front apart..... thanks
Peterbilt 379 AC problems
Discussion in 'Trucks [ Eighteen Wheelers ]' started by bigstank, Jul 26, 2015.
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Change the condenser.
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Most places add dye as standard operating procedure. At least I know the TA's, my local shop and the Peterbilt dealers I've used over the years have. Something may not have been installed tightly enough, or may have just wiggled loose ie. hoses
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Is the fresh air door hung open?
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try turning your setting to recirculation instead of fresh air
check the coolant lines coming off the engine head and see if there is a valve you can shut to kill the heat in the cab. -
I've got the water knob off and always use recirculation. Idk it's got me puzzled
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