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Wiper Doors

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69VETTE:

--- Quote ---Originally posted by 77CVT
;42

The door goes down when the wipers are on fast and then things get ugly from there.

I haven't had much to do with early C3's so I am sure I'll be bugging you all frequently.
--- End quote ---



There is suppose to be a safety switch under the door near the wipers to not allow this.  Maybe this swtich has dunn its nanna...;27


M;36

Chromie:
Hi 77CVt;42

Your problem of the wiper door closing when wipers are in operation sounds like the interlock valve, which is located at the right wiper arm, assuming that all your vacuum hoses are routed correctly.;27
This interlock valve senses the position of the arm and if it thinks that your wiper arm has parked it will allow the closing of the wiper door.;50

77CVT:
Thanks Chromie.  I think I'll be replacing vacuum hoses where ever I can.

RHD.68.l89:
Does the door try to close immediately you switch to high? Could be the vacuum solenoid is losing it's electrical signal when you switch to high and the safety interlock (as mentioned earlier) is faulty.
A common fault is the door opening under wide open throttle as the vacuum signal disappears but there is still vacuum in the tank to operate the door. Not related to your fault but common anyway.
Congrats on the purchase!

MADLT1:
there is a guide called  troubleshooting,the 1968-1982 headlight and windshield wiper door vacuum system.it is available at mid america and is a must for all c3 owners.the vacuum system on these cars is complex,but simplified in this guide;42

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