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*VERY* occasional HVAC malfunction

Discussion in '3rd Gen Tundras (2014-2021)' started by Kung, Oct 9, 2020.

  1. Oct 9, 2020 at 7:11 PM
    #1
    Kung

    Kung [OP] FNG

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    I got into my truck this afternoon and started it up, and didn't see the 'little man' in the HVAC display (the one that indicates where the airflow is going). (FYI, I've got the dual-climate system.) I then noticed that despite being set to the front dash vents, the air only blew out of the top dash vents (e.g., defrost).

    I've owned my truck (2020 CrewMax) since mid-March; and I've only seen this happen two times, and both times it's resolved itself with a truck stop/restart, so I'm not too worried about it. Still, I'm curious as to whether or not anyone else has run into this, if it's all that common, etc.
     
  2. Oct 9, 2020 at 11:34 PM
    #2
    preacher35

    preacher35 RIGHTEOUS MEMBER

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    Haven't run into that issue, but I would definitely get that sorted under warranty.
     
  3. Oct 10, 2020 at 4:41 AM
    #3
    timsp8

    timsp8 Member

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    I remember seeing another thread about this a few months ago. I think he took it in and they replaced the thing that selects where the air goes behind the dash, but don’t remember the details. Try to search and maybe it’ll be the same as your issue.
     
  4. Oct 10, 2020 at 6:18 AM
    #4
    BrandonL812

    BrandonL812 New Member

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    If it's still on. Take a video of it. If it go away who knows when it will come back. If you have video of it, you can show it to the dealership.
     
  5. Oct 10, 2020 at 8:10 AM
    #5
    CaptainGrumpus

    CaptainGrumpus The Mailman

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    Definitely take a video of it because it’s so random. The dealer will fix it based on the video if they can duplicate it
     
  6. Oct 10, 2020 at 8:18 AM
    #6
    Lovetrucks

    Lovetrucks Member

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    That sounds like a blend door issue .
     
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  7. Oct 11, 2020 at 5:30 AM
    #7
    Kung

    Kung [OP] FNG

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    Well, that's what I'd normally think. However, both times it happened, I've noticed a few things:

    1. Other things occur (e.g., the screen showing the vent door position malfunctions).
    2. If I turn the truck off and back on, it works just fine.

    In other words, it may be a blend door issue, but it almost 'feels' like an electronic issue as well. (On a side note, if I CAN'T fix it under warranty since it happens so infrequently, I wonder if I can eventually just replace the dual climate control with your standard knob HVAC controls.)
     
  8. Oct 11, 2020 at 5:30 AM
    #8
    Kung

    Kung [OP] FNG

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    I will once I can get it on video again...may take a few thousand miles.
     
  9. Oct 11, 2020 at 5:40 AM
    #9
    trucksareforgirls2

    trucksareforgirls2 New Member

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    I have a 2020, and no HVAC issues...

    -T
     
  10. Oct 11, 2020 at 8:48 AM
    #10
    Lovetrucks

    Lovetrucks Member

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    I wasn’t sure about the tundras but with Ram if it’s a blend door issue they usually just have to reflash the computer to fix it .
     
  11. Oct 11, 2020 at 7:12 PM
    #11
    Kung

    Kung [OP] FNG

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    That's good to hear. To be clear - the actual AC/heat itself works just fine; it's just that the 2 times I've seen things go on the fritz, it would only come out the top dash vents.

    I'll likely just wait until the next time it happens, and then will drive straight to the dealership to have them capture it after taking a video or two.
     
  12. Feb 23, 2021 at 7:06 AM
    #12
    Kung

    Kung [OP] FNG

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    Update:

    So it happened for a week straight during *that week* (anyone who got caught in the last storm KNOWS what I mean). Heat worked fine but it defaulted to the defroster, period. Of course, after an entire week, literally as soon as I brought it to the dealership, it worked fine. I was SUPER pissed. I had to reassure them I was pissed at it 'working fine' when I brought it in.

    They told me they'd call the 'regional Toyota FTS' (unsure what that means). They just got back to me and told me that there are some initialization tests they can run to determine specifically what component is screwed up, so they can then replace those components, and not just shotgun the whole thing. Got an appt. for next Monday, and then they'll hear back once they provide the findings to the FTS.

    I have to admit that I thought dealerships themselves could (and had the resources to) troubleshoot this sort of stuff. :confused:
     
  13. Feb 23, 2021 at 8:59 AM
    #13
    sethcphoto

    sethcphoto First Gen Freak

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    FTS is a field technician. When us normal technicians have a problem like this we can't figure out, we have an FTS agent come out to the dealer and he's able to pull more strings with Toyota. Since this problem is so intermittent and those components are so expensive for a vehicle under warranty, Toyota wants the FTS to document everything going on and do advanced electrical diagnoses that they are trained to do before Toyota pulls the trigger on warrantying a $2k AC amplifier.
     
  14. Feb 23, 2021 at 9:10 AM
    #14
    sethcphoto

    sethcphoto First Gen Freak

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    Toyota has gotten very careful with warranty stuff recently and they have to make it a huge deal to replace big stuff under warranty. There's a lot of things that come into the dealership where we as technicians know what is wrong, we just can't prove it to Toyota because it's intermittent and therefore we can't get the approval to replace it. Everything has to be documented and we there's a checklist of things we have to do in order to warranty something.
    The FTS agents get paid to diagnose this sort of stuff so that's why the FTS is called in to do more difficult warranty diagnoses instead of the normal dealership technician cause we don't get properly paid for warranty stuff.
     
    Kung [OP] likes this.
  15. Feb 23, 2021 at 9:22 AM
    #15
    Sundog

    Sundog New Member

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    Just hope that if they have to replace something it is small and can be accessed easily. If the rod to you blend door decides to take a crap on you it is a very unpleasant and costly situation. Even more so if you are out of warranty.
     
  16. Feb 27, 2021 at 10:52 AM
    #16
    Kung

    Kung [OP] FNG

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    Thankfully, it's definitely under warranty; it's a 2020 purchased last March, and it's only got 16K on it. :)
     
  17. Feb 27, 2021 at 11:00 AM
    #17
    Kung

    Kung [OP] FNG

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    That makes sense, and I can appreciate it. It just frustrates me (as an IT guy) that I can literally document what happens every startup/shutdown (e.g., what temp/fan position/vent position/etc.), what the temp inside/outside is, take videos.....and none of it matters because "Well, the truck wasn't here." I know why they say that; and as a nerd I can't disagree with it, but it doesn't mean it's not frustrating. LOL
     
  18. Mar 1, 2021 at 4:21 PM
    #18
    Kung

    Kung [OP] FNG

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    Update: Brought the truck in for whatever test the FTS guy recommended, and *bingo* they found a servo somewhere that was either failing, or wasn't putting out correct voltage, causing the HVAC system to fail to default. The part will be in tomorrow/Wednesday, at which point they'll repair it.

    Only took almost a year to find it! LOL
     
    MaxMB and Sumo91 like this.

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