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Please Help Identify HVAC Noise

Discussion in '2.5 Gen Tundras (2014-2021)' started by the red, Jan 10, 2023.

  1. Jan 10, 2023 at 4:27 PM
    #1
    the red

    the red [OP] the threat is real

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    I'm trying to pinpoint this while I've got my dash apart. Just about a minute after I turn off the truck (and sometimes when I start it) I get this noise:

    https://youtube.com/shorts/FyaFmZV8LS8

    I feel like it's one of the vent doors itself rubbing, but please let me know if you have an idea. Does anyone know what doors it would be operating after the truck shuts down?
     
  2. Jan 10, 2023 at 4:42 PM
    #2
    Kung

    Kung Dead sexy

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    I have the same issue, though mine is nowhere *NEAR* as loud as that. LOL
     
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  3. Jan 10, 2023 at 4:43 PM
    #3
    KNABORES

    KNABORES Sarcasm incoming

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    Thats the basement door. Where the boiler is. It’s scary down there.
     
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  4. Jan 10, 2023 at 4:49 PM
    #4
    FrenchToasty

    FrenchToasty The Desert rat, 6 lug enthusiast

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    None
     
  5. Jan 10, 2023 at 5:00 PM
    #5
    the red

    the red [OP] the threat is real

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    Alright, I’ll just live with it then. haha

    @Kung might have to do with the fact that that mine is approaching 300k km’s.
     
  6. Jan 10, 2023 at 5:18 PM
    #6
    Fallingblock

    Fallingblock New Member

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    In my professional amateur opinion it is 100% a noise, and 20% maybe not
     
  7. Jan 10, 2023 at 5:19 PM
    #7
    Rocko9999

    Rocko9999 New Member

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    Blend door?
     
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  8. Jan 11, 2023 at 6:09 AM
    #8
    Sumo91

    Sumo91 Busy with projects

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    Mine has been making a similar noise since i got the truck, doesn't really bother me, I assumed it was normal. Lets me know my blend door is working too. I'm sure a little silicon grease would make it nice and quiet.
     
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  9. Jan 11, 2023 at 6:19 AM
    #9
    MyActualName

    MyActualName New Member

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    IMO a blend door for the AC/heat. I'd be worried about the motor burning out.
     
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  10. Jan 11, 2023 at 6:28 AM
    #10
    mountainpete

    mountainpete Explore more

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    Function before sparkle.
    Yes, that is the blend door resetting position. It automatically does that after you turn off the truck. Not sure if the noise is the actuator or the door itself, but it's a bugger to replace. The majority of the dash needs to come off.
    If you can live with the noise and it still works, I would leave it.
     
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  11. Jan 11, 2023 at 6:38 AM
    #11
    MyActualName

    MyActualName New Member

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    ^ This

    Mine made noises for a while until it didn't. Then I only had defrost, no upper or lower air. Not a cheap or easy repair.
     
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  12. Jan 11, 2023 at 6:52 AM
    #12
    Retired...finally

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    Sounds like you need to shop vac the farts out of the seat cushions.
     
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  13. Jan 11, 2023 at 6:54 AM
    #13
    Sundog

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    All the way down to the firewall....very little left.
     
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  14. Jan 11, 2023 at 7:50 AM
    #14
    mountainpete

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    Function before sparkle.
    Yes, it’s full open surgery.

    I had it done under warranty because blend door failed at 5k. Was painful to have done on a new truck.
     
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  15. Jan 11, 2023 at 8:54 AM
    #15
    Sundog

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    upload_2023-1-11_10-54-12.jpg
     
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  16. Jan 11, 2023 at 9:01 AM
    #16
    mountainpete

    mountainpete Explore more

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    Function before sparkle.
    My truck wasn't that far but close. It was two days at the dealer. Fortunately the tech did a great job and added extra felt tape when he put it back together. No squeaks.
     
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  17. Jan 11, 2023 at 9:05 AM
    #17
    Jim LE 1301

    Jim LE 1301 Camaro Lover, SSEM # 11,TTC#179

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    :eek2:
    And I thought removing the radio surround was bad.
     
  18. Jan 11, 2023 at 10:47 AM
    #18
    Sundog

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    And this was at 8 or 9 PM (techs had left for the day) and we were supposed to leave for a long trip the following afternoon. We actually did leave on time.
     
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  19. Jan 11, 2023 at 10:51 AM
    #19
    the red

    the red [OP] the threat is real

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    Awesome response! Thanks guys, @mountainpete @MyActualName @Sundog & @Sumo91 notably. As I mentioned, my dash is apart already, so now's the time to address it. It's currently stripped down beyond what it was when I took this picture.

    I like the thought of adding more felt tape too. Thanks for that.

    Another question for you guys: There's one bolt to the dash "subframe" that looks like it'll hit the driver's door before coming out. How do you manage to remove it without removing the door?
     
  20. Jan 11, 2023 at 11:01 AM
    #20
    Kung

    Kung Dead sexy

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    Man...if I had my dash apart to this level I'd line the @#$# out of everything with NVH before putting it back together.
     
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  21. Jan 11, 2023 at 12:48 PM
    #21
    Sundog

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    @thered Right now is the perfect time to check the AC drain, at the floor and at the HVAC that is being installed. There have been a couple of instances, me included, where the gasket material is partially occluding the opening. Is just something to check.
     
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  22. Jan 11, 2023 at 12:54 PM
    #22
    Sundog

    Sundog Zoom Zoom

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    AND....run 1 or 2 wires all the way across from 1 door opening to the other (with extra on the ends to be able to go into the doors at a later date). I so wish I had the foresight to have done this.....

    Would make wiring up power folding mirrors (in the future) easier.

    I also agree with getting something like dynomat down under the carpet. Hell, your at the firewall already, why not.
     
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  23. Jan 11, 2023 at 3:46 PM
    #23
    the red

    the red [OP] the threat is real

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    @Sundog I don’t quite follow, what do you mean by HVAC being installed? I suppose as I progress I’ll see where this drain is and check it though. Thanks.

    I plan on doing sound deadening mat, though it’s not really in the budget for this. It’s a good point though. I’ll see about it. Dynomat especially isn’t cheap.

    As for running wiring, again a good idea. I do have heated, folding mirrors already. I’m sure there are other things it would be useful for though.
     
  24. Jan 11, 2023 at 4:51 PM
    #24
    Sundog

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    Ah...that's right. Yours is just making a sound. My HVAC box had to be replaced (twice) - blend door shaft failure (snapped) and then new HVAC box had a hole in it, leaked water out.

    upload_2023-1-11_18-50-18.jpg
     
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  25. Jan 12, 2023 at 5:43 AM
    #25
    Jeff_5_7

    Jeff_5_7 New Member

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    Definitely sounds like the blend door rubbing or binding on the wall of the HVAC box.

    This is the inside of a 2015 HVAC box.
    Here the door is in the middle, partial AC, partial heat.
    FB8B593C-F2FC-4C4D-9F14-8549E0F8A050.jpg

    Here it is closed to one side for heat only. You can see the heater core in the back of the box.
    8F41CA37-3998-4E4F-8C8B-2D3C2F80ADC5.jpg

    The AC evaporator coil would be at the bottom but it is removed in these photos.

    Air going through the evaporator coil is cold, going through the heater core is hot. Blend door decides how much of which comes out your vents.
     
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  26. Jan 12, 2023 at 5:46 AM
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    Kung

    Kung Dead sexy

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    Dumb question - do they replace for just making noise?

    Asking because I've had this noise as well (though nowhere NEAR as bad) in addition to the AC amplifier/solenoid thing (where you turn it on, it's blank for 30 seconds, then defaults *ONLY* to defroster mode) occasionally.
     
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  27. Jan 12, 2023 at 7:16 AM
    #27
    the red

    the red [OP] the threat is real

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    Thanks so much! I'll remove it today or tomorrow and get a good look.

    @Kung I doubt it, though I feel like the noise is symptomatic of what would eventually burn the motor out, then need replacement.
     
  28. Jan 12, 2023 at 7:48 AM
    #28
    Kung

    Kung Dead sexy

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    Right...about 3 miles after warranty goes out. LOL ;)
     
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