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Thread: 1988 Grand Marquis

  1. #1
    Join Date
    Sep 2008
    Posts
    3

    Default 1988 Grand Marquis

    either on the vent or air conditioning settings when I excellerate the air turns to heat and then when I let off the gas it returns to outside air or AC.

  2. #2
    Join Date
    Jan 2007
    Posts
    4,850

    Default

    rogerd52 - You have a vacuum leak in the system.

  3. #3
    Join Date
    Sep 2008
    Posts
    3

    Default

    Where would be the best place to check for the vacuum leak? How do I check for the vacuum leak?

  4. #4
    Join Date
    Feb 2008
    Location
    Tampa FL
    Posts
    32

    Default

    Rogerd52 - Check around the firewall near the windshield wiper motor. It's a little black vacuum box which you should see a vacuum line connected to it. If not replace or re trace were its running from and replace it with a new one or hook it back up

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