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Thread: 1988 Buick Park Avenue - Help me here....

  1. #1
    Join Date
    Feb 2003
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    Conway, Arkansas
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    13,181

    1988 Buick Park Avenue - Help me here....

    My parents gave us my mom's Buick Park Avenue. It's in really nice shape and mechanically sound. However, the A/C blows at the floor and at the windshield as if it is trying to defrost. I pressed all the button of the control board but nothing makes it change to blowing air out the normal A/C vents. I know that are things like vacuum lines under there and such and solenoids that move the flaps that channel the air.

    How can I fix this where it blows the A/C our the normal forward facing vents/channels instead of it blowing out the locations for winter heat?

    1988 Buick Park Avenue with all the bells and whistles. V6 engine and front-wheel drive
    Thanks & Happy Wood Chips,
    Dennis -
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  2. #2
    I am not sure if all of the controls on that one are vacuum or not but I would say go to the Buick forum and see what they have to say.

    http://www.buickforum.com/forum/

  3. #3
    Join Date
    Jan 2006
    Location
    Grand Forks, ND
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    2,336
    Dennis, The mode controls for the heater/ac system on this car are all vacuum operated. The "default" position for the mode control is defrost/heat. The first thing I'd look for is a vacuum leak under the hood. This system starts with a source vacuum on the engine (line off the throttle body), it runs to a vacuum reservoir (I will attach a pic.) That would be the first place to start, if there is vacuum to the reservoir then the problem lies after the res. if no vacuum the the problem is in the engine bay. I'd suspect a problem in the engine bay as that is most likely (broken plastic line). If the problem is under the dash you should hear a hissing noise inside the car when you move the selector for the mode position. I'll be happy to answer any questions you might have if you want to go further. reservoir.gif
    A bus station is where a bus stops. A train station is where a train stops. My desk is a work station.

  4. #4
    Join Date
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    The reservoir is next to the power brake booster under the hood?
    Thanks & Happy Wood Chips,
    Dennis -
    Get the Benefits of Being an SMC Contributor..!
    ....DEBT is nothing more than yesterday's spending taken from tomorrow's income.

  5. #5
    Join Date
    Jan 2006
    Location
    Grand Forks, ND
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    Quote Originally Posted by Dennis Peacock View Post
    The reservoir is next to the power brake booster under the hood?
    Thats what my alldata shows Dennis, let me know if its not there.
    A bus station is where a bus stops. A train station is where a train stops. My desk is a work station.

  6. #6
    Join Date
    Mar 2006
    Location
    Manheim PA
    Posts
    84
    Dennis, I had an 80 Olds with a similar problem. The actuator controlling the air deflection broke, and that vane always went to defrost. The dealer wanted $$$$$$$ to remove the dash to repair, so I figured out how to change the air flow, and every fall and spring I changed it. It was a nuisance but I never did repair it. Good luck with yours.

  7. #7
    Join Date
    Feb 2003
    Location
    Conway, Arkansas
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    13,181
    Jeff,
    Thanks.....I went back and looked again after studying your drawing. I see it and am tracking down the lines as time / work permits.
    Thanks & Happy Wood Chips,
    Dennis -
    Get the Benefits of Being an SMC Contributor..!
    ....DEBT is nothing more than yesterday's spending taken from tomorrow's income.

  8. #8
    Join Date
    Feb 2003
    Location
    Conway, Arkansas
    Posts
    13,181
    OK....thanks Jeff..!!!!!

    Fixed it.....vacuum hose was the problem.
    Thanks & Happy Wood Chips,
    Dennis -
    Get the Benefits of Being an SMC Contributor..!
    ....DEBT is nothing more than yesterday's spending taken from tomorrow's income.

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