1989 Brougham heat and air problem
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 1989 Brougham heat and air problem in Past Cadillac Vehicle Discussion; Hey guys, I have a 1989 Brougham and I do not have any air comming out of my vents when ...
  1. #1
    dman47564 is offline Cadillac Owners Member
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    Jun 2013
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    1989 Brougham heat and air problem

    Hey guys, I have a 1989 Brougham and I do not have any air comming out of my vents when I turn on my air conditioner or heater. Can someone tell me what is going on?

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  3. #2
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
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    Re: 1989 Brougham heat and air problem

    You have a vacuum hose off most likely. Lack of vacuum would direct all the air thru the defroster vents. Find the vacuum source hose under hood at the intake manifold and see if its off or split.

  4. #3
    j2rossit is offline Cadillac Owners Enthusiast
    Automobile(s): 85 FW Brougham, 68 Wildcat 'vert, 92 & 96 Roadmaster Wagons
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    Re: 1989 Brougham heat and air problem

    Is the blower motor running?

  5. #4
    sven914 is offline Cadillac Owners Connoisseur
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    Re: 1989 Brougham heat and air problem

    In order for the A/C or heat to come on, the temperature set on the ECC needs to be above/below the outside and inside temperature; also the heat will not come on until the engine has reached 150°.

    An easy way to test the system is to put the temperature at either 60° or 90° AUTO, and the blower will default to HI regardless of the inside or outside temperature. In some cases, the ECC will not automatically turn on the blower when the engine reaches operating temp (this can be caused by a broken wire or a malfunctioning programmer) and to get the blower to turn on, you need to hit DEF then AUTO, and the air come out right vents (for either heat or A/C) and the blower will automatically adjust to the temperature set on the ECC.


    If the blower doesn't turn on when the ECC is set to DEF, check the blower to make sure it is grounded and plugged into the power module (located near the passenger side fire wall). If it is grounded and plugged in, then replace the blower motor. If the replacement blower motor doesn't work, replace the power module.

  6. #5
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
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    Re: 1989 Brougham heat and air problem

    Great instructions but I would run a test wire from the battery positive post to the blower to verify it works first. But..............we still dont know if its a blower or vacuum problem because the poster hasn't replied.

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