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7/13/15 8:42am - Original Message: 'wiper door open and close.'
Former Member
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Lexington, KY - USA

1971 base coupe

Joined: 7/3/2015
Posts: 2
I'm new on the forum since just purchasing a 1971 base coupe. The car is very sound and runs great but has a few little issues I'm addressing. I've been lurking around reading prior post. The wiper door on my car opens when I start the car. Then, as I'm driving around it closes and reopens intermittently. Seems to close when RPMs are UP and then opens when car goes back to idle. Anybody experienced these symptom and know the fix? Thanks, Joe
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7/13/15 8:54am - Reply: 'Re: wiper door open and close.'
dads2vette Lifetime Member
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Ash Fork, AZ - USA

1981 Red Interior White exterior

Joined: 4/18/2007
Posts: 1046
I am going with a vacuum leak.  I am unfamiliar with your year but thought I'd chime in to let you know that someone with more knowledge will answer.  Also, Welcome to the club!

Dave C..........My mantra: I can not be bought!!      Long and short term leases available.
In the words of Zora Arkus-Duntov "Is your seat belt fastened? Alright, Let's go"

Yeah, I know, Shut up Dave.
Lifetime Member #192

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7/13/15 12:03pm - Reply: 'Re: wiper door open and close.'
F4Gary Gold Member
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Grapevine, TX - USA

1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 933
Probably the vacuum regulator that is mounted on the back side of the passenger wheelwell liner.

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7/13/15 6:02pm - Reply: 'Re: wiper door open and close.'
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Gig Harbor, WA - USA

1973 L82 4 Speed Coupe - Very original, well documented driver/survivor. 2016 Bend Regional NCRS Top Flight.

Joined: 10/2/2014
Posts: 395
F4Gary said: Probably the vacuum regulator that is mounted on the back side of the passenger wheelwell liner.

+1 on Gary's response. You should also check the vacuum check valve. It should allow vacuum to travel from the headlights, wiper door etc. to the intake manifold, but not the other way. Look for the main vacuum hose coming out of the intake manifold behind the carb. Follow that line you should come to a small plastic disc thing in the line (vacuum filter). A little farther down the line you'll see a similar metal disc shape that splits the vacuum into two lines one goes forward up to the head lights, the other goes towards the windshield wipers and cabin. That metal disc is the vacuum check valve, make sure air flows only one way, towards the motor. If that check valve is faulty the wiper door and headlights may pop open when the engine vacuum drops. Easy to check, easy to replace if faulty. Welcome to the site and good luck !!

John Sigmund
NCRS Member 61302
NW NCRS Chapter Member

Duct tape is the new Black !!
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