Update on windshield wiper 1969
Thread Starter
Cruising
Joined: Apr 2025
Posts: 13
Likes: 0
Update on windshield wiper 1969
I had a previous post about the wipers on my 69 not working, well l got everything working sort of .. wipers work when the door is up and switch is made when I shut the wipers off the door goes down perfectly and wipers park .. but the door does not open when the switch is turned on .. l lift it to make the switch .. any advise ??
Instructor
Joined: Apr 2021
Posts: 104
Likes: 65
From: Southern New England USA
From your previous post were you able to answer the questions in post #17?
Does the override switch open the wiper door?
https://www.corvetteforum.com/forums...ting-help.html
Does the override switch open the wiper door?
https://www.corvetteforum.com/forums...ting-help.html
Thread Starter
Cruising
Joined: Apr 2025
Posts: 13
Likes: 0
We’ll there you go .. no it doesn’t, headlights come up no problem .. vacuum leak l assume your opinion ?? .. l apologize for any forum etiquette l am missing l haven’t done this forum stuff in years..
Last edited by Benchvise; Apr 21, 2025 at 06:52 PM.
Burning Brakes
Joined: Sep 2020
Posts: 832
Likes: 810
From: Chapin SC 29036
It sounds like it might be an issue with the Vacuum control motor solenoid. This mounts to the back of the Tachometer and is fairly miserable to get to. There are two yellow wires and two blue wires attached to it. There are yellow and blue hoses attached to it. The yellow hose is the vacuum source. I will attach a diagram of the vacuum system.
1967 Pedal Car Champion
Joined: Mar 2020
Posts: 9,140
Likes: 4,248
From: US-PNW
1969-corvette-vacuum-hose-diagram-12apr2024-48393333d1745157840
Look at Robertea's diagram linked above. Since you are getting vacuum to the headlight over-ride valve, the issue must be at or after the T-fitting that splits to the wiper valve. Follow the vacuum line to the solenoid (mounted behind the tach), to the over-ride valve (under the steering column), to the wiper arm valve (through the firewall to the wiper arm trough). It's a somewhat complicated system that is not helped by the poor reliability of currently available parts.
Do you have a vacuum pump of some sort that you can test the different sections of the circuit? (Mity-vac is fine but can take a while to pump down vacuum - especially when testing the headlight actuators!)
Look at Robertea's diagram linked above. Since you are getting vacuum to the headlight over-ride valve, the issue must be at or after the T-fitting that splits to the wiper valve. Follow the vacuum line to the solenoid (mounted behind the tach), to the over-ride valve (under the steering column), to the wiper arm valve (through the firewall to the wiper arm trough). It's a somewhat complicated system that is not helped by the poor reliability of currently available parts.
Do you have a vacuum pump of some sort that you can test the different sections of the circuit? (Mity-vac is fine but can take a while to pump down vacuum - especially when testing the headlight actuators!)
