Vacuum system solenoid?
Thread Starter
3rd Gear
Joined: Nov 2023
Posts: 3
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Vacuum system solenoid?
Although there are numerous threads about the vacuum system, I cannot find any info about the "vacuum solenoid" attached behind the tachometer. What is it for and how do you test it?
Melting Slicks
Joined: Jan 2012
Posts: 3,041
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From: myrtle beach sc
Army
Joe, please mention the year of your Corvette. Only the 68-72 Corvette had the electric solenoid behind the tachometer for the wiper panel that hides the wiper blades.
There are also vacuum operated valves for the front headlights and also the wiper panel or "wiper door". These are not electric, but are vacuum actuated. I hope that this helpes you out. Lou.
There are also vacuum operated valves for the front headlights and also the wiper panel or "wiper door". These are not electric, but are vacuum actuated. I hope that this helpes you out. Lou.
Race Director
Joined: Apr 2011
Posts: 11,183
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From: North of Toronto - Ontario
Year always helps.Only used on the cars with the wiper door.
But to answer your question.
From another post (check down around #22) https://www.corvetteforum.com/forums...lem-ugh-2.html
The wiper switch, when turned on, sends an electric signal to the "tach solenoid" which shuts off the vacuum at the solenoid and opens the rest of the line all the way to the relay to open the door. with the wiper switch off, the solenoid lets the vacuum through. It goes in the back port where the wires are and out the SIDE port at the other end, the straight port on that end is the vent. Check for vacuum at the end where the wires are. if there's vacuum there, the solenoid is suspect
M
