Windshield Wiper Arm Control Valve
Race Director
Joined: Apr 1999
Posts: 10,860
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From: Beverly Hills/Pine Ridge Florida
Re: Windshield Wiper Arm Control Valve (Chris81)
Basically, it won't "allow" the wiper door to come down, on 68-72 Corvettes, till the wipers are in the "park" position. It's a vacuum "switch". That way, you can't close the wiper door, or have it accidentally close till the wipers are all the way down. Chuck
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Burning Brakes
Joined: Jul 2000
Posts: 1,118
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Re: Windshield Wiper Arm Control Valve (Chuck Gongloff)
Tnx, Chuck... I know what it's there for, but trying to get info on it's operation within the vacuum system, like when the wipers aren't parked, the spring loaded plunger is up and when they're parked, it's down. Trying to find out what that valve is controlling to keep the doors open until the wipers are parked.... It's not working at the moment, so I use the override to keep the door open until the wipers park themselves, then I'll shut the door. The hoses are in sorry shape. The top hose is cut and plugged, the middle goes thru the firewall to whatever, and the bottom looks like it goes to the top position on the wiper door vacuum relay valve. Uh, I think I need a vacuum diagram... :crazy:
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Burning Brakes
Joined: Jul 2000
Posts: 1,118
Likes: 0
Re: Windshield Wiper Arm Control Valve (Chris81)
Found out that the top hose is just an air vent that passes through the firewall and stops. Mine had the end plugged, which evidently is what people do when they see a dangling vacuum hose that doesn't seem to go anywhere...
Can anyone tell me how to test the valve? When the plunger is down, should ANY air be able to escape if you plug one of the two lower fittings and blow into the other? Or perhaps better stated as - should it hold a vacuum when the plunger is down? Those things are $50+ so want to make sure I really need one!
Can anyone tell me how to test the valve? When the plunger is down, should ANY air be able to escape if you plug one of the two lower fittings and blow into the other? Or perhaps better stated as - should it hold a vacuum when the plunger is down? Those things are $50+ so want to make sure I really need one!
Le Mans Master
Joined: Oct 2001
Posts: 5,943
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From: Wildwood IL
Re: Windshield Wiper Arm Control Valve (Chris81)
Not at home right now to be sure exactly which one....but one of those hoses (the one that's plugged) is an exhaust, and should run from the valve through the firewall to nowhere. Unplug it!!
Eddie
Eddie
