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2017 international lonestar AC issues

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Arctic_fox, Aug 18, 2025 at 8:26 PM.

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  1. Aug 19, 2025 at 5:36 PM #11
    Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    I can't do much over the internet. AC is 100% computer controlled in these. You need someone with access to International DLB software to watch the signals which watching the pressures to see what is happening. If it turns warm, but water still drains, I agree it is freezing up. There is a signal the body controller will get from the freeze probe. In DLB you need to look for this signal - HVAC_Freeze_Protect_HZN. It should be the same as ambient when the system is not running. When running it will signal the body controller to cut power to the compressor at anything lower in temp than 43 degrees F. When these sensors are shorted, they read about 140 degrees all the time and never change.
     
    Heavyd, Aug 19, 2025 at 5:36 PM
    Heavyd, Aug 19, 2025 at 5:36 PM
    #11
    JB7 Thanks this.
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  3. Aug 19, 2025 at 8:49 PM #12
    Arctic_fox

    Arctic_fox Experienced mx13 execrator

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    Sep 16, 2016
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    Sorry for the late reply. Been driving in chicago and it feels like every moron here is out to cause a wreck for lulz heh....

    Anyway no recycle switch @North Pole Nightmare , and thanks for the tip on the international software, ill add it to my guidanz and look at it after my bank pulls my truck payment in a couple days. That said im unsure if it would be that. I just looked at my stack of bills and it does list a temp probe was replaced at the same time as the CECU. But ill check it again when i have the software. Worst case maybe i can flash the body computers and see if i can un#### the system @Heavyd. I can also likely can pull screens of the data it gives me too and see if it pops up anything stupid and see if you can give advice on fixing it.
     
    Arctic_fox, Aug 19, 2025 at 8:49 PM
    Arctic_fox, Aug 19, 2025 at 8:49 PM
    #12
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