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A/C Vents Still Quirky 200 1992

posted by  JMC2041 on  Sun Nov 1 14:49 CST 2009
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last visit: Sun Oct 12 19:42 CST 2014
[RELATED]

A/C is cold but dash vents are whimsical and take turns working properly--occasionally they work fine and then other times not. If I adjust the fan speed and turn the A/C switch off and on that sometimes that gets air flowing again. Everything is fine when I stop and re-start the car or start it first thing.

Thanks to previous BB help I replaced the black and white vacuum check valve on the intake manifold. That was not the only problem so I'm wondering if there are other vacuum valves under the dash that need attention? Are there diagrams available that show what controls the opening and closing of the dash vents, the defroster, etc.? Any other ideas?

I'm in the Sunbelt so I'll be using my A/C year round.

Thanks for your help.







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    A/C Vents Still Quirky 200 1992

    posted by  rchan5 on  Tue Nov 10 06:01 CST 2009
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    last visit: Mon Oct 20 11:40 CST 2014
    [RELATED]

    Hi,
    This is my first post, but have learned much from the BB--Thanks to all!
    Anyway, I recently went through the pain of replacing the climate control switch on my 79 245. The good news,for me anyway, was that each vacuum line was pre-numbered from the factory, with corresponding numbers on the control switch. (vacuum hose diagram for dummies).Much to my suprise,air goes where it's supposed to, now.

    Russ

    1979 245 400,000+ mi
    1989 745 210,000 mi








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    A/C Vents Still Quirky 200 1992

    uid 12839's pic
    posted by  Paul Driver of Inga on  Mon Nov 2 01:17 CST 2009
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    last visit: Sun Mar 25 16:42 CST 2012
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    Sounds like you have a loose vacuum line either from the bottle to the climate control switch or one or more vacuum lines loose on the control switch. Very much a PITA to take the center console loose, unplug all the switches to pull the climate control out to check. Have new light bulbs standing by if you have any lights out. Bet if you pull it all loose and can get eyes on the back of the switch, at least one if not more lines have popped off back there.

    Good Luck,

    Paul








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      A/C Vents Still Quirky 200 1992

      posted by  mossguy on  Fri Nov 6 18:36 CST 2009
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      last visit: Mon Mar 24 12:51 CST 2014
      [RELATED]

      I am having a similar experience with my vents. I removed the dash to replace the windshield wiper mechanism, and would like to address the vents before dash re-install.

      Does anyone have a schematic for the vacuum lines behind the dash, or know where I can find one? The Bentley isn't much help.

      Thanks,

      Tom







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