power to air conditioner compressor clutch all the time with key on

Discussion in 'Peterbilt Forum' started by William watkins, Aug 19, 2018.

  1. William watkins

    William watkins Bobtail Member

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    Aug 19, 2018
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    Have a 379 peterbilt just put new engine in need to know if wire 242 is the correct wire to go to the a/c compressor it is hot all the time that the key switch is on builds high pressures and blows relief on back of compressor also need to know which wire goes to engine oil temperature sensor has a cat 3406b engine.
     
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  3. snowwy

    snowwy Road Train Member

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    Jul 6, 2009
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    Is your fan kicking on????

    It's pretty impossible to get pressure high enough to blow out. Fan kicks on around 275. Keeps the high pressure around 140 for a few minutes before it shuts off. Every semi i've done a/c work on anyways. I've never been able to accomplish an overcharge.
     
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