1971 Hearse a/c problem

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500, 472, 425, 368 Discussion, 1971 Hearse a/c problem in Cadillac Engine Discussion; I just purchased a 1971 Hearse with the 472 motor. The a/c works great but only blows out of the ...
  1. #1
    haley2 is offline Cadillac Owners Member
    Join Date
    Jul 2006

    1971 Hearse a/c problem

    I just purchased a 1971 Hearse with the 472 motor. The a/c works great but only blows out of the center floor area. The control will not change where the air comes from. Any Ideas or direction in which to go to check this would be greatly appreciated. Thanks Ben

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  3. #2
    Broughamadrosis's Avatar
    Broughamadrosis is offline Cadillac Owners Fanatic
    Automobile(s): 2-90 Brougham 5.7, 82 S&S Hearse
    Join Date
    Oct 2004

    Re: 1971 Hearse a/c problem

    The blend doors are vacuum controlled - check all the vacuum lines under the dash - for starters. There's a bunch of them between the control head and the programmer (heater box).
    Also check to make sure the vacuum source from under the hood is connected.
    Sometimes the ports on the head or programmer get clogged-up, especially on a car that sits/has sat for a long time.
    It could also be debris in the heater box (leaves, mouse nest, etc.) that prevents the blend door from moving.

  4. #3
    haley2 is offline Cadillac Owners Member
    Join Date
    Jul 2006
    Thread Starter

    Re: 1971 Hearse a/c problem

    I think it is the head because I can get the doors to function by providing vacum to the lines directly behind the head. Do not know where to get the rotary vacum switch though.


  5. #4
    JTraik is offline Cadillac Owners Enthusiast
    Automobile(s): '68 DeVille '95 FWB '99 Eldo '96 6BT Ram 5MT
    Join Date
    Mar 2004

    Re: 1971 Hearse a/c problem

    Try cadillactim.com they specialize in HVAC systems for this generation.

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