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Thread: '03 with HVAC whistling behind center dash vents?

  1. #1
    Manic Mechanic is offline Cadillac Owners Fanatic
    Automobile(s): 2001 DeVille
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    '03 with HVAC whistling behind center dash vents?

    I have a '03 base Deville coming in later that has developed a moderate air whistle behind the center dash vents. The faster you run the blower fan the louder it gets. Opening and shuting the internal doors with the rotating knobs changes from really loud closed to still there full open. It seems like there's a leak in the duct work or something stuck in there that makes the noise. When on auto and the blower speed is low it's barely there but anytime it's working hard you hear it good. When on floor or defrost it's gone.

    Has anyone had to deal with this and what did you find?

    Thanks,
    Vernon


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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: '03 with HVAC whistling behind center dash vents?

    I have a slight whistle from one of my vents when it's closed (which is never). It's from the deteriorated (or missing) foam seal around the valve (door), but that would not explain it being audible when open.

  4. #3
    Manic Mechanic is offline Cadillac Owners Fanatic
    Automobile(s): 2001 DeVille
    Join Date
    Sep 2011
    Location
    Magnolia, TX (NW of Houston)
    Age
    47
    Posts
    411

    Re: '03 with HVAC whistling behind center dash vents?

    Yeah when I was looking at it I found most of the vents closed (grand-kids playing) and as I started opening them it would quiten down but it never went completely away and at full strength blow it is still excessive and odjectionable.

    Vernon

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    69
    Posts
    82,272

    Re: '03 with HVAC whistling behind center dash vents?

    Gotta be one of the doors (valves) farther up line then.


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