72 wiper door closes when wiper still up? - NCRS Discussion Boards

72 wiper door closes when wiper still up?

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  • John Hames

    72 wiper door closes when wiper still up?

    I have been working with my wipers and wiper door for a while now. I have managed to get the wipers to come on and the door to actually open and close, but I have still got one little problem. When I go to turn the wipers off the door shuts immediately, and of course the wipers are always up. Does anyone have any suggestions on what I may try to prevent this?

    Thanks

    John
  • Wayne W.
    Extremely Frequent Poster
    • April 30, 1982
    • 3605

    #2
    Re: 72 wiper door closes when wiper still up?

    There is a delay valve on the left side under the wiper grille. It is either bad or misadjusted.

    Comment

    • Patrick H.
      Beyond Control Poster
      • December 1, 1989
      • 11608

      #3
      Re: 72 wiper door closes when wiper still up?

      Wayne,

      I believe it is on the right, or passenger, side of the car. The vacuum lines to it pass through the firewall just lateral to (outboard of, right of) the wiper door vacuum canister. These wiper limit switches do frequently go bad and would cause this symptom. Fortunately, new ones are still available, current price is $18 from The Last Detail.

      Patrick Hulst


      The Last Detail
      Vice-Chairman (West), Michigan Chapter NCRS
      71 "deer modified" coupe
      72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
      2008 coupe
      Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.

      Comment

      • Juliet P.
        Very Frequent User
        • June 30, 1999
        • 349

        #4
        Re: 72 wiper door closes when wiper still up?

        I agree with the other guys... it's probably the valve under the wiper grille on the passenger side at the base of the wiper arm. It has a plunger on top which the wiper depresses when it parks. You can still get these from GM but I believe they are subtly different configuration wise from the originals. Pictures on my web page in the wiper bay restoration area. ~Juliet


        Juliet's '70 Stingray Page
        2019 Sebring Orange 8-Spd Coupe (daily driver & autocross) 6k mi.
        1970 Bridgehampton Blue Convertible - Chapter Top Flight 2005 68k mi.
        1965 Coupe (Greg's project No Flight)
        Gone but not forgotten:
        1987 Yellow Convertible 199k mi.
        2002 Yellow Convertible 100k mi.
        2007 Atomic Orange Coupe 140k mi. RIP flood 2015
        2007 Lemans Blue 6-Spd Coupe 34k mi.

        Comment

        • Wayne W.
          Extremely Frequent Poster
          • April 30, 1982
          • 3605

          #5
          Re: 72 wiper door closes when wiper still up?

          Your right Patrick it is on the right. Too late to think straight.

          Comment

          • Joe L.
            Beyond Control Poster
            • February 1, 1988
            • 43193

            #6
            Re: 72 wiper door closes when wiper still up?

            John-----

            The valve that was mentioned by others and which is the likely source of your problem is GM #5638487 which is still available and currently GM lists for $39.41.
            In Appreciation of John Hinckley

            Comment

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