Windshield Wiper Delay?????
Thread Starter
Instructor
Joined: Jun 2002
Posts: 176
Likes: 0
From: New Albany IN
Windshield Wiper Delay?????
On my '70 the windshield wipers wait about 30 seconds before the windshield wiper door opens and the wipers come on when you move the windshield wiper switch. If you use the bypass switch under the steering wheel the windshield wiper door opens immediately and if you turn on the windshield wiper switch the windshield wipers come on immediately. My question is what is causing the 30 second delay when you turn the windshield wipers on using the windshield wiper switch?
Drifting
Joined: Mar 2003
Posts: 1,608
Likes: 3
From: Canberra AUSTRALIA
St. Jude Donor '05-'06
Vaccum leak. The normal vaccum circuit has a leak in it. If I had to guess I would say the relay right next to the brake master cylinder. Look at the vaccum diagram for the wiper door and follow it through.
Pete
Pete
Thread Starter
Instructor
Joined: Jun 2002
Posts: 176
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From: New Albany IN
That is a new vaccum relay and it seems to be working perfectly. The only part of the system that I haven't checked is the solenoid that is activated by the windshield wiper switch that is up under the dash. The solenoid makes a good strong click when you turn on the windshield wiper switch. The location of the switch is making it difficult to test.
Race Director
Joined: Nov 1999
Posts: 10,643
Likes: 8
From: Foxfield CO 1970 Convertible
Originally Posted by Raydon 3000
That is a new vaccum relay and it seems to be working perfectly. The only part of the system that I haven't checked is the solenoid that is activated by the windshield wiper switch that is up under the dash. The solenoid makes a good strong click when you turn on the windshield wiper switch. The location of the switch is making it difficult to test.
(As I remember, there is a vacuum hose to this one also, which could be another source of leakage).
Thread Starter
Instructor
Joined: Jun 2002
Posts: 176
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From: New Albany IN
Since the wiper door opens when there is no vacuum on the control for the actuator relay, a kinked line would keep the door open all the time, so I don't think that is the problem. My guess at this time would be the solenoid is closeing slowly, thus causing the delay. But that solenoid is making a strong click when the windshield wiper switch is turned on. I've got to get the solenoid out of there some how. As Z-man stated I may have to take that side of the dash out, which I have done a few times. Does anyone know where I can get another solenoid if I can't fix this one? I looked in several catalogs and called a few of them and I haven't found anybody that sells them.
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Team Owner
Joined: Jun 2001
Posts: 23,381
Likes: 1,067
From: Virginia USA
They are not available. Check the 1971 registry website for rebuild instructions. Its easy.
http://www.71corvette.com/wiper.html
http://www.71corvette.com/wiper.html
Last edited by theandies; Apr 25, 2005 at 10:58 PM.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Originally Posted by Raydon 3000
... Does anyone know where I can get another solenoid if I can't fix this one? I looked in several catalogs and called a few of them and I haven't found anybody that sells them.
Team Owner
Joined: Jun 2001
Posts: 23,381
Likes: 1,067
From: Virginia USA
Originally Posted by theandies
They are not available. Check the 1971 registry website for rebuild instructions. Its easy.
http://www.71corvette.com/wiper.html
http://www.71corvette.com/wiper.html
Pro
Joined: Aug 2004
Posts: 728
Likes: 1
From: Patchogue New York
Originally Posted by Raydon 3000
Since the wiper door opens when there is no vacuum on the control for the actuator relay, a kinked line would keep the door open all the time, so I don't think that is the problem. My guess at this time would be the solenoid is closeing slowly, thus causing the delay. But that solenoid is making a strong click when the windshield wiper switch is turned on. I've got to get the solenoid out of there some how. As Z-man stated I may have to take that side of the dash out, which I have done a few times. Does anyone know where I can get another solenoid if I can't fix this one? I looked in several catalogs and called a few of them and I haven't found anybody that sells them.
part #331118 1968 - 1972 Solenoid, wiper door vacuum control valve $ 49.75
