Noisy air conditioning / heater vents
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  • 1 Post By 928S
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2008-2013 Cadillac CTS General Discussion Discussion, Noisy air conditioning / heater vents in Cadillac CTS Second Generation Forum - 2008-2013; Has anyone expereinced rattling air vents? 2 of the vents on my 2008 CTS sedan rattle with the fan on ...
  1. #1
    jakoch is offline Cadillac Owners Member
    Automobile(s): 2008 CTS Sedan
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    Noisy air conditioning / heater vents

    Has anyone expereinced rattling air vents? 2 of the vents on my 2008 CTS sedan rattle with the fan on any speed above 2. Do they pop out from the front or back? I think if I can get them out I can quiet them down by applying a little dielectric grease on the moving parts. Any help or suggestions would be greatly appreciatated!

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  3. #2
    exhaust_freak's Avatar
    exhaust_freak is offline Cadillac Owners Fanatic
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    I got the noise, but no solution

  4. #3
    928S is offline Cadillac Owners Connoisseur
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    Re: Noisy air conditioning / heater vents

    Which HVAC vent(s)?
    Just in case, here's a TSB for the L/R front center:

    Technical Service Bulletin No. 08-08-49-014
    Date: September 10, 2008
    Subject: Rattle Type Noise Coming From Instrument Panel (IP) Center Air Outlet Deflector(s) (Add Mylar Washer)

    Models: 2008 Cadillac CTS
    Condition: Some customers may comment on a rattle type noise coming from either instrument panel center air outlet deflector.
    Cause: This noise may be caused by the shut-off door rattling in the deflector housing.
    Correction: Add a mylar washer to the center air outlet deflectors using the procedure below.
    1. Remove the radio control assembly from the IP. Refer to the Radio Control Assembly Replacement procedure in SI.
    2. Unsnap the air deflector (1) from the radio control assembly.
    3. From the back side of the deflector (1), disengage the shut-off valve (2) from the deflector housing by prying the top edge (opposite side of shut off thumb wheel) of the door away from the deflector housing.
    4. Slide a Mylar washer, GM P/N 15911310, (3) over the end of the shut-off valve's locating pin (4).
    5. Snap the shut-off valve (2) back to the original position with the Mylar washer (3) in place.
    6. Reinstall the air outlet deflector into the radio control assembly.
    7. Repeat Steps 2 through 6 for the other center air outlet deflector.
    8. Reinstall the radio control assembly. Refer to the Radio Control Assembly Replacement procedure in SI.
    _________________________________________

    FP Number 11561653, Description Clip 14.630
    FP Number 15911310 , Description Washer 12.809
    99flhr likes this.

  5. #4
    avi1777 is offline Cadillac Owners Member
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    Re: Noisy air conditioning / heater vents

    put it on windshield function for 5 seconds then put it back,it will go away.

  6. #5
    hauler's Avatar
    hauler is offline Cadillac Owners Enthusiast
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    Re: Noisy air conditioning / heater vents

    that sounds easier than removing the radio

  7. #6
    Neutrocuted's Avatar
    Neutrocuted is offline Cadillac Owners Fanatic
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    Re: Noisy air conditioning / heater vents

    Quote Originally Posted by avi1777 View Post
    put it on windshield function for 5 seconds then put it back,it will go away.
    I just picked-up this 2008 Premium for the ole ball-and-chain and that's one of her complaints, among many others and I'm not totally familiar with the controls available in this thing. Are you saying to turn on the defroster for 5 seconds (obviously, long enough for the actuators to move to another position) then turn it off?... or is there another position/button/knob to twist/push/dial?

    Thanks

  8. #7
    tinman's Avatar
    tinman is offline Cadillac Owners Connoisseur
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    Re: Noisy air conditioning / heater vents

    Quote Originally Posted by Neutrocuted View Post
    I just picked-up this 2008 Premium for the ole ball-and-chain and that's one of her complaints, among many others and I'm not totally familiar with the controls available in this thing. Are you saying to turn on the defroster for 5 seconds (obviously, long enough for the actuators to move to another position) then turn it off?... or is there another position/button/knob to twist/push/dial?

    Thanks
    I would do exactly what you wrote...put it on defrost and let the blend doors move into position.
    Neutrocuted likes this.

  9. #8
    928S is offline Cadillac Owners Connoisseur
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    Re: Noisy air conditioning / heater vents

    Yeah...switch to defrost mode for 5 seconds and rattle is gone for 5 seconds, switch for 10 seconds and rattle is gone for 10 seconds, if you're lucky, and so on and so forth...

    At least that was my experience until the TSB permanent fix (above) was performed on my '08 CTS. Before, with climate control set to auto mode, front center vents rattled only in hot weather >90°F, and then only for a few minutes after startup until AC cooled the ductwork, deflector, fittings; but nothing could say "POS" more clearly than that damn rattle...lol

    So good luck and best wishes to all early-2nd-gen CTS owners still dealing with this inexplicable factory defect.

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