Carrier Comfortpro Apu not blowing air

Discussion in 'Trucks [ Eighteen Wheelers ]' started by DriverRomy, Jun 19, 2019.

  1. DriverRomy

    DriverRomy Bobtail Member

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    So, I recently bought a used (low hours) carrier comfortpro apu with the bunk blower for my truck. The generator works fine but when I try to use the blower(HVAC) for a/c or heat inside my truck it doesn't work. No air gets blown but the generator still works. On the driver control panel (the screen to control it) it says there are no faults but the temp is usually higher than it is(For example, if its 25°C inside the truck, it says its 35°C on the screen). I called Reefer Sales(Carrier dealer in my area) and they said it might be a temp sensor issue causing it not to blow air and I might need to replace the bunk unit. I was wondering if anybody else had this problem and how they managed to fix. Can I just buy a new temp sensor and repair or do I need to a new bunk unit? Just exhausting all my avenues of help to see if there's any possible ways of fixing it.
     
    Last edited: Jun 19, 2019
  2. Rounded_nut

    Rounded_nut Light Load Member

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    Does the fan come on at all? Might be worth the hundred bucks or so to pop by the dealer for a diagnostic.
     
  3. bavarian

    bavarian Medium Load Member

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    I agree. Anything else without a proper diagnosis will end in just throwing parts at it.
    It could be a blown fuse somewhere or a faulty blower motor, or simply a disconnected wire.
     
  4. bzinger

    bzinger Road Train Member

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    Mine started doing something strange a couple months ago .
    Occasionally when I would start it and turn the AC on and it ran for a while a message would come up saying " check apu engine "
    Or occasionally when I would start it would show a " restarting " message but would never crank over .
    When it would show the check engine message it never shut and kept right on blowing cold air and never had a code .
    Simply shutting it off and restarting it solved both issues and wouldn't happen again for weeks .
    A couple days ago it started doing it every time I started it and the comfort mode wouldn't work although the engine would start so i just ran it on continuous with the message displayed ..check apu engine.
    Yes this is windy lol......so today when I stopped ..before I started it i unplugged both connectors from the control boxes in the apu housing along with the harness to the alternator and starter and plugged them all back in and fired it up ...wala ! No messages and it's been running a couple hours now .
    All connectors appeared clean and tight .
    Ohhhhh and I wash out the apu engine and housing every couple months so i put dielectric grease on the connections.
    What did i do ? Did this reset something? Cause it's doing everything its supposed to now .
     
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  5. x1Heavy

    x1Heavy Road Train Member

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    Why is it every summer we have drivers weeping that they cannot get cool over something that will sit there and do nothing until it's pulled off every possible connection wire and cleaned, wait a hour and plug back in.

    Sure it's great driving that wonderful plush tractor trailer, but you have to do some scraping now and then for your repose in the hot summer night after your labors.
     
    bzinger Thanks this.
  6. bzinger

    bzinger Road Train Member

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    You know I'm a clean freak heavy when I wash my apu engine lol.
     
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  7. bzinger

    bzinger Road Train Member

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    Checked with my shop pal today and he said I reset the ECM.
    Hasn't sent a message since and does what its supposed to do .
     
  8. WitchingHour

    WitchingHour Road Train Member

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    There’s a CAT5 cable which runs from the control panel to the CECU. That often works its way loose.

    ‘Resetting the ECU’ sounds like bull (excrement) to me, personally.
     
    bzinger Thanks this.
  9. bzinger

    bzinger Road Train Member

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    Yeah I think you are right but will say it ran flawlessly for another 4 nights which beat going into a road shop but about 3 this morning it started sending messages again , when I started it this evening I had repeat the process several times until it would stay running and the starter sounded ugly .
    Its locked on continuous now and will go into the shop tmw when I get home ...starter is only 6 mos. Old so it's under warranty if that's the problem.
     
  10. bzinger

    bzinger Road Train Member

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    The CAC cable was loose .
     
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