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APU coolant system plumbing question.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by calvinbabb, Sep 17, 2022.

  1. Sep 17, 2022 #1
    calvinbabb

    calvinbabb Light Load Member

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    Apr 28, 2016
    Trenton, Fl.
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    I currently have a carrier comfort Pro that has its own radiator system on it. I want to plumb it into the truck coolant so that during the winter the APU will help keep the engine warm for cold day start up. I’m thinking, in theory, I only need to cut into one of the heater lines going to the bunk basically running the coolant from the radiator towards the bank diverting it to the APU, and then back up to where I cut in to the Same line headed towards the heater coil. Basically what I’m asking is, I should only have to cut into one of the heater lines going to the bunk, correct?
     
    calvinbabb, Sep 17, 2022
    calvinbabb, Sep 17, 2022
    #1
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  3. Sep 17, 2022 #2
    Antinomian

    Antinomian Road Train Member

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    Feb 17, 2013
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    Mine (09 Cascadia) was plumbed that way, but it was plumbed in parallel, not in series. I think it's best not to have the restriction of having to push APU coolant through the bunk heater core. Make sure you add shut off valves on both the feed and return sides. I used to get leaks when I first bought the truck. Connections had to be really really tight there.

    If you're truck is an older Cascadia you will have the annoyance of having to deal with two different size lines to the bunk heater core. One was 3/4 and one was 3/8. But you'll want 3/4 on both sides going to the APU. This is what I used for that: Four Seasons 84757 Plastic T-Type Hose Splicer. Be careful, they break.
     
    Antinomian, Sep 17, 2022
    Antinomian, Sep 17, 2022
    #2
  4. Sep 17, 2022 #3
    GYPSY65

    GYPSY65 Road Train Member

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    Nov 16, 2012
    SW FLA
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    If your truck has an electric motor heater you should also be able to plug it in

    A friend of mine did that. Just ran an extension cord to the external plug in
     
    GYPSY65, Sep 17, 2022
    GYPSY65, Sep 17, 2022
    #3
  5. Sep 17, 2022 #4
    calvinbabb

    calvinbabb Light Load Member

    66
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    Apr 28, 2016
    Trenton, Fl.
    0
    It’s on a 18’ t680 but should be similar
     
    calvinbabb, Sep 17, 2022
    calvinbabb, Sep 17, 2022
    #4
  7. Sep 17, 2022 #5
    calvinbabb

    calvinbabb Light Load Member

    66
    41
    Apr 28, 2016
    Trenton, Fl.
    0
    I bought the truck second hand and when I got to checking there is no block heater on this truck. This is why I want a plumber APU into it. I tend to run up into Montana and stuff quite a bit in the winter, so that little extra will help at start up. I know I can add a block heater, but figured might as well just plummet APU into it and be done with it.
     
    calvinbabb, Sep 17, 2022
    calvinbabb, Sep 17, 2022
    #5
    GYPSY65 Thanks this.
  8. Sep 17, 2022 #6
    Dave_in_AZ

    Dave_in_AZ Road Train Member

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    May 4, 2015
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    My tripac is plumbed into the radiator. As was mentioned shut off / isolation valves for supply and return.

    It has a Wabesto though. It definitely saves the day in freezing conditions.
     
    Dave_in_AZ, Sep 17, 2022
    Dave_in_AZ, Sep 17, 2022
    #6
    GYPSY65 Thanks this.
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