'69 wiper issue
Thread Starter
Burning Brakes
Joined: Oct 1999
Posts: 1,047
Likes: 1
From: Arlington Texas
'69 wiper issue
took the '69 for a drive today (it was sprinkling) and had no problems until I had been driving for about 45 minutes.
I had been turning the wipers on and off intermittantly because it wasnt coming down that hard. All of the sudden, the wiper door just shut on the wiper arms.
I pulled over, and pulled the door open to let the arms retract.
I sat for a minute and tried again: door opened, wipers went a couple of times, I turned it off and the wipers retracted and the door closed.
I didn't try the wipers again until I was almost home. I turned it on and everything worked fine until the wipers had gone maybe a 8-12 times then the door closed on them again!
Why would the door close on the arms like that?
I had been turning the wipers on and off intermittantly because it wasnt coming down that hard. All of the sudden, the wiper door just shut on the wiper arms.
I pulled over, and pulled the door open to let the arms retract.
I sat for a minute and tried again: door opened, wipers went a couple of times, I turned it off and the wipers retracted and the door closed.
I didn't try the wipers again until I was almost home. I turned it on and everything worked fine until the wipers had gone maybe a 8-12 times then the door closed on them again!
Why would the door close on the arms like that?
Racer
Joined: Aug 2005
Posts: 431
Likes: 0
From: Oita, Japan
I think the relay that controls the door opening and closing must be getting vacuum on the control side when it shouldn't. The wiper switch cuts vacuum to the relay to signal it to open the door. My guess would be a slow vacuum leak in the wiper switch (meaning it isn't able to completely cut off the vacuum). But, its purely a guess. Does it stay open when you pull down the override switch under the dash?
Thread Starter
Burning Brakes
Joined: Oct 1999
Posts: 1,047
Likes: 1
From: Arlington Texas
Originally Posted by yukon988
I think the relay that controls the door opening and closing must be getting vacuum on the control side when it shouldn't. The wiper switch cuts vacuum to the relay to signal it to open the door. My guess would be a slow vacuum leak in the wiper switch (meaning it isn't able to completely cut off the vacuum). But, its purely a guess. Does it stay open when you pull down the override switch under the dash?
I know the relay itself has a slow leak (I pulled it off and bench tested it) but I don't know if the switch has a leak or not.
Racer
Joined: Oct 2005
Posts: 324
Likes: 0
From: Vancouver BC
Originally Posted by StickShiftCorvette
You also need to look at the wiper parked interlock. The wiper door is prevented from closing until the wipers are parked if adjusted and working properly.
This is what i need to adjust on my '72.
Le Mans Master
Joined: Oct 2001
Posts: 5,943
Likes: 3
From: Wildwood IL
Originally Posted by driver68
Ok, where is this "wiper parked interlock"??
This is what i need to adjust on my '72.
This is what i need to adjust on my '72.
http://www.corvettefaq.com/c3/68wiperts.xls
Eddie
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Thread Starter
Burning Brakes
Joined: Oct 1999
Posts: 1,047
Likes: 1
From: Arlington Texas
Ok, bought a new relay (old one leaked) and a new check valve (old one inoperative).
Same problem.
removed-cleaned-tested-replaced wiper door 3port interlock switch.
Same problem.
cleaned-tested wiper door actuator.
Same problem.
to recap, the wipers run 5-6 strokes, then the door closes on the arms.
I have replaced 98% of the vac hose, and checked the connections and routing using Doc Rebuilds Troubleshooting guide and poster (Thanks Doc!).
I haven't tested the wiper door solenoid valve switch or the manual override switch yet.
Frustrating.
Same problem.
removed-cleaned-tested-replaced wiper door 3port interlock switch.
Same problem.
cleaned-tested wiper door actuator.
Same problem.
to recap, the wipers run 5-6 strokes, then the door closes on the arms.
I have replaced 98% of the vac hose, and checked the connections and routing using Doc Rebuilds Troubleshooting guide and poster (Thanks Doc!).
I haven't tested the wiper door solenoid valve switch or the manual override switch yet.
Frustrating.