Wiper Vacuum Questions
Thread Starter
Drifting
Joined: Aug 2003
Posts: 1,327
Likes: 16
From: Fl
Wiper Vacuum Questions
Hey Guys ...
I have never had any problems with my wiper system .. this morning
after using my wipers several times, the door decided to not open.
It happens even when I use the override under the dash.
If I move the door manually to the open position and then move the switch under the dash, to close the door, it works fine. Just no upward movement.
Any suggestions ??
I'm figuring there are two vacuum relays, the one under the cowl and the other under the right side fender.
Which would you think is most likely the culprit ??
Any help is appreciated.
Thanks
Bill
I have never had any problems with my wiper system .. this morning
after using my wipers several times, the door decided to not open.
It happens even when I use the override under the dash.
If I move the door manually to the open position and then move the switch under the dash, to close the door, it works fine. Just no upward movement.
Any suggestions ??
I'm figuring there are two vacuum relays, the one under the cowl and the other under the right side fender.
Which would you think is most likely the culprit ??
Any help is appreciated.
Thanks
Bill
Instructor
Joined: Aug 2004
Posts: 142
Likes: 1
From: Minnesota
It's difficult to say which vacuum relay is giving you problems- the position sensing relay under the wiper door or the one under the fender. They can each be tested by pulling a vacuum (either with a vacuum pump or just by sucking on the hose) to the center port and plugging the outboard port to check for leaks in the seal. The relay under the fender is vauum actuated and you can feel/hear it switching when you suck on the smaller actuator port and then let it go- it will make a small clunking sound when you let the vacuum off.
These can be rebuilt by either following the instructions here:
http://209.183.231.72/corvette-101/vacuum.htm#relay
(as well as more detailed diagnostics), or I have actually put Orings around the plunger seal once inside the relay (you have to grind out the inside to make them thinner- PITA)
It's unlikely that it's your wiper door actuator giving you problems, since it uses the same diaphragm to move up as down.
-=Boston!=-
These can be rebuilt by either following the instructions here:
http://209.183.231.72/corvette-101/vacuum.htm#relay
(as well as more detailed diagnostics), or I have actually put Orings around the plunger seal once inside the relay (you have to grind out the inside to make them thinner- PITA)
It's unlikely that it's your wiper door actuator giving you problems, since it uses the same diaphragm to move up as down.
-=Boston!=-
Thread Starter
Drifting
Joined: Aug 2003
Posts: 1,327
Likes: 16
From: Fl
Hey All ...
Well here it is...
The rubber boot that is inside of the wiper door canister - popped out.
I just happened to slide the dust boot back to inspect it and it was staring me in the face !
Thanks
Bill
Well here it is...
The rubber boot that is inside of the wiper door canister - popped out.
I just happened to slide the dust boot back to inspect it and it was staring me in the face !
Thanks
Bill
Melting Slicks
Joined: Dec 2003
Posts: 2,487
Likes: 1
From: Sydney
Originally Posted by 72ls5fla
Hey All ...
Well here it is...
The rubber boot that is inside of the wiper door canister - popped out.
I just happened to slide the dust boot back to inspect it and it was staring me in the face !
Thanks
Bill
Well here it is...
The rubber boot that is inside of the wiper door canister - popped out.
I just happened to slide the dust boot back to inspect it and it was staring me in the face !
Thanks
Bill
Well, my wiper door doesn't work, not even the override switch...which is a bummer...sounds like I have a vacuum leak.. Im going to replace the hoses with a hose kit from Doc Rebuild.
But can I ask something>> The wiper door canister - is that on the passenger side in the engine bay against the firewall?? the thing that you take off the rubber grommet so that you can manually override the wiper door?
Le Mans Master
Joined: Oct 2001
Posts: 5,943
Likes: 3
From: Wildwood IL
Originally Posted by cosmicvette
But can I ask something>> The wiper door canister - is that on the passenger side in the engine bay against the firewall?? the thing that you take off the rubber grommet so that you can manually override the wiper door?
Eddie
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Melting Slicks
Joined: Dec 2003
Posts: 2,487
Likes: 1
From: Sydney
Originally Posted by Silvr77
Yes. Technically known as the wiper door actuator.
Eddie
Eddie
Im about to go and see if I can look up under the dash from underneath and see if there is a hose thats come off.
(theres a loud hissing sound from under the dash when I have the engine running).