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2010 International Prostar AC problem

Discussion in 'International Forum' started by Sam- Owner Operator, Oct 23, 2015.

  1. Oct 23, 2015 #1
    Sam- Owner Operator

    Sam- Owner Operator Bobtail Member

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    Oct 23, 2015
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    A month ago the AC went out on my 2010 International Pro-star and we replaced the condenser, AC Compressor, dryer, expansion valve, filter, and the compressor line to the condenser. After that the AC worked for one day and then quit working again. So then I took it to an International Dealership and they replaced the thermistors. Then it worked really well up until now (about a month) and now it only comes on when the truck is driving but doesn't come on when in idle or stopped. The fan is not coming on either and I do not have an override switch for the fan. I did just have some work done at Cummins a few days ago and they fixed the exhaust manifold gasket and replaced the filter on the crank case as well as did an oil change and changed a clogged oil filter. There are no lights on in the truck at this time. Any help would be greatly appreciated!
     
    Sam- Owner Operator, Oct 23, 2015
    Sam- Owner Operator, Oct 23, 2015
    #1
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  3. Oct 23, 2015 #2
    Heavyd

    Heavyd Road Train Member

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    If they recalibrated the ecm there is a good chance that "multiplexing" got turned off accidentally. Multiplexing is a parameter setting that allows the ECM to communicate properly with the body controller. Call the Cummins shop and ask them if they recalibrated the ECM.
     
    Heavyd, Oct 23, 2015
    Heavyd, Oct 23, 2015
    #2
    Sam- Owner Operator Thanks this.
  4. Oct 23, 2015 #3
    Sam- Owner Operator

    Sam- Owner Operator Bobtail Member

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    Oct 23, 2015
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    Thank you for your response. I just called Cummins and they said they did not recalibrate the ECM. They think it may be a censor out but said they don't work on AC units.
     
    Sam- Owner Operator, Oct 23, 2015
    Sam- Owner Operator, Oct 23, 2015
    #3
  5. Oct 24, 2015 #4
    devedo

    devedo Light Load Member

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    Aug 11, 2015
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    I would still have someone double check the parameter settings on the ecm. I've gone through and had a few that had parameters changed by someone that didn't know what they were doing.

    I would figure out the issue with the fan first. Your fan not coming on at idle would affect how well the a.c. works at idle because the condensor cannot do it's job without airflow.

    Check and make sure the fan solenoid is working and there is also a three wire pressure switch in line going to your condesor that controls a.c.

    There is also a parameter setting in the ecm that enables fan control using that sensor.
     
    devedo, Oct 24, 2015
    devedo, Oct 24, 2015
    #4
    Sam- Owner Operator Thanks this.
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