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C15 acert cooling fan staying on and only building 32 PSI boost max

Discussion in 'Trucks [ Eighteen Wheelers ]' started by hot day, Feb 15, 2014.

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  1. Feb 26, 2014 #11
    hot day

    hot day Bobtail Member

    19
    5
    Dec 7, 2013
    0
    Took the truck to cat here in Indy, they rewired the air solenoid from the ecm cool fan working now. I also had them do a DYNO since scan gauge was only showing 32PSI boost max. Its rated at 435HP truck has 680K miles it put down 380HP to the ground. Stupid scan gauge isn't reading anything right. Time to return it.
     
    Last edited: Feb 26, 2014
    hot day, Feb 26, 2014
    hot day, Feb 26, 2014
    #11
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  3. Feb 26, 2014 #12
    BAYOU

    BAYOU Road Train Member

    2,847
    1,592
    Sep 23, 2010
    Beaumont,Tx
    0
    my scan gauge don't read right either now that you see what it makes hp I'd like to know what your gauge shows mine shows 419hp and I don't think that's close
     
    BAYOU, Feb 26, 2014
    BAYOU, Feb 26, 2014
    #12
  4. Feb 27, 2014 #13
    Mr. Haney

    Mr. Haney Road Train Member

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    2,040
    Dec 17, 2008
    0
    The A/C high pressure switch uses a ground as a signal to the ECM to turn the fan ON/OFF. More then likely you have a wire that has rubbed through the insulation and is grounding out against the engine or truck somewhere causing the fan to stay on. You need CAT ET to monitor the A/C pressure switch activation in the ECM to see if this is the problem.
     
    Mr. Haney, Feb 27, 2014
    Mr. Haney, Feb 27, 2014
    #13
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