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Topic: '72 Wiper Door Malfunction

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'72 Wiper Door Malfunction (5/15)
3/13/09 9:24am

rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1171

hope this helps

http://www.C3VR.com/member_pages/4201_4300/4221/Vacum-wiper-Headlight.jpg

'72 Wiper Door Malfunction (6/15)
3/13/09 10:15am

Adams' Apple

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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20189

Roger...I e-mailed the info earlier today...."You've got Mail"...

If it didn't come thru, let me know, and I'll re-send it.

And yes, the metal check-valve is what I was referring to...it will cause the door to open a little, or all the way, depending on HOW it is malfunctioning. I say take a trip over to Phil's house, and do a little "parts swap"...

Just kiddin...but it would be an easy test to see if that is in fact the problem.

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Joel Adams
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'72 Wiper Door Malfunction (7/15)
3/13/09 11:01am

rdupler2
Former Member
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Hurst, TX - USA

Vette(s):
1972 Corvette Coupe. 350/200 Automatic with PS/PB/PW and A/C. Beautiful Bryar Blue. Unmolested original. Shooting for NCRS Top Flight someday.

Joined: 10/14/2007
Posts: 173

Robert, thanks for the link to the picture! That is great info. I appreciate that.

Joel, me thinks you have a good idea. Phil's at work today and I have the key to his garage Evil%20Smile

!!!!!!!!!!

I called and talked to "Mike" at Bairs. He was confident it was the check valve also. He's fixed me up with the check valve and a new filter for that line - a little over $20 bucks.

Thanks Joel very much for the pictures you sent. That is some great info also. My wife was in the e-mail before me this morning and she had clicked it and it didn't show up in BOLD print in the inbox anymore. That's why I overlooked it this morning.

Roger

'72 Wiper Door Malfunction (8/15)
3/13/09 7:52pm

Adams' Apple

Glad Mike was able to take care of ya, Roger!

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'72 Wiper Door Malfunction (9/15)
3/24/09 2:48pm

Well I replaced the check valve and filter in the vacuum line off the intake manifold and it did not fix the problem Unhappy

. Wiper door still raises back up about 3/8 inch 4 to 5 minutes after engine shutdown.

But this time, as I was bending over the right side of the car looking and wondering over the engine bay, I heard a sound like air rushing thru an orifice coming from under the right fender Shocked

. It was the Wiper Vacuum Relay. I started the engine, let the wiper door seat and shut the engine down. I hear the noise between the 4 and 5 minute mark every time just before the wiper door raises up.

Do you think it's a bad wiper vacuum relay or something between the relay and the bypass valve/solenoid valve arrangement under the dash that is the culprit????

'72 Wiper Door Malfunction (10/15)
3/24/09 6:19pm

Adams' Apple

It's the relay leaking...

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'72 Wiper Door Malfunction (11/15)
3/26/09 8:54pm

Joel, Thanks for the thought.

I was reading on another forum Shocked

that the small hose going to the actuator housing of that relay is the "control" line. Vacuum to that line causes the valve to operate and send vacuum to the front side of the wiper actuator on the firewall. If you lose vacuum on that relay actuator e.g., if that control line or a device in that control line leaks, then you will lose vacuum on the relay actuator and it will move in the other direction via spring force and thus cause the relay valve to send vacuum to the other side of the wiper actuator thus opening the wipre door Wacko

Oh well Phil and I will check it out asome more this weekend and will let you know what we find. Might be able to "borrow" the relay from Phil's car and test since his being a '69 it is very easy to get to.

'72 Wiper Door Malfunction (12/15)
3/27/09 5:05am

Adams' Apple

That's exactly how it works...spring and all! The valve has a "at rest" position. This position is supposed to leave the wiper door in the open position if there is a problem with the vac. system...sort of a "fail-safe" deal.

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'72 Wiper Door Malfunction (13/15)
3/27/09 8:44am

F4Gary
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air. 2017 Black Rose Grand Sport convertible.

Joined: 8/26/2006
Posts: 1491

If you do replace the relay, don't forget to recheck the timing on the engine since you just plugged a vacuum leak. I replaced mine just before we went on a Corvette Club cruise to Jefferson. It pinged all the way over and back. I couldn't figure it out until it just hit me. Duh.

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Re: '72 Wiper Door Malfunction (14/15)
3/25/25 7:40am

Martonea
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Winter Haven, FL - USA

Vette(s):
1972 454 Classic White Convertiy

Joined: 5/30/2024
Posts: 1

OK, I’ve read this thread and I’m still stuck wiper door open wipers come on for the windshield wiper switch. However, my manual override will not open the door. Any thoughts? I can’t find a vacuum leak anywhere.

Re: '72 Wiper Door Malfunction (15/15)
3/25/25 10:46am

F4Gary
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air. 2017 Black Rose Grand Sport convertible.

Joined: 8/26/2006
Posts: 1491

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