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my 72 Vette wiper door closes on wipers at different intervals

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my 72 Vette wiper door closes on wipers at different intervals

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Old 08-12-2018, 12:49 PM
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DC1972
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Default my 72 Vette wiper door closes on wipers at different intervals

!972 Corvette wiper door closes on wipers at different positions. I have to keep trying to park them multiple times to get them close to parking in the full close position but rarely can get them in the perfect spot. Door closes quickly and does not wait until the wipers are fully down. Any suggestions as to the culprit.

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Old 08-12-2018, 02:07 PM
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kansas123
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Did it just suddenly start acting like that? Any history on you working on that system?
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Old 08-12-2018, 03:47 PM
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Old 08-12-2018, 10:16 PM
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DC1972
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Originally Posted by kansas123 View Post
Did it just suddenly start acting like that? Any history on you working on that system?
no, it has been this way since I bought it back in January
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Old 08-12-2018, 10:43 PM
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Originally Posted by DC1972 View Post
!972 Corvette wiper door closes on wipers at different positions. I have to keep trying to park them multiple times to get them close to parking in the full close position but rarely can get them in the perfect spot. Door closes quickly and does not wait until the wipers are fully down. Any suggestions as to the culprit.
This happened to me (also a 72) yesterday. Got caught in a thunderstorm and the wiper door would shut on the wiper arms at various positions pinching them not allowing them to sweep. Weird thing was when I let off the accelerator the wiper door would open back up and the wipers would return to normal but as soon as I got back on the throttle the door closed again. I'll be testing the various vacuum components this week and will post what I find.
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Old Yesterday, 08:26 AM
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Sounds like it might be caused by the wiper door safety switch, which is underneath the passenger side wiper arm near it's pivot point. It tells the wiper door that the arms are parked and it's okay to close.
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Old Yesterday, 11:06 AM
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DC1972
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I was thinking it was probably the safety switch also since it only close on the wiper arms when I turn the wipers off and not any other time. Is the safety switch vacuum controlled or electrical?
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Old Yesterday, 07:22 PM
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Also, Tex, there is a one-way valve so you don't lose can vacuum when you hit the throttle. Yours is either blown or nonexsistant. Reminds me of school busses when I was a kid. Drivers had to lift off gas to make the vacuum wipers go.

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Old Yesterday, 07:31 PM
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DC1972
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It is defiantly the safety switch under the wiper door, passenger side. It pretty much fell apart once I got to it. Does anyone know if the heater hot water shut off vacuum valve for 77 to 79 is the same as the wiper vacuum safety switch on the 72. they both look identical except the hot water valve is half the price for the one that is made in the USA.
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Old Yesterday, 08:54 PM
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Originally Posted by DC1972 View Post
I was thinking it was probably the safety switch also since it only close on the wiper arms when I turn the wipers off and not any other time. Is the safety switch vacuum controlled or electrical?
It is a vacuum switch.

By the way, does the switch under the steering column work? The pull down **** on the right side of the large round **** controls the vacuum door: if you pull it down (with the car running), the vacuum door should open and stay open. The round **** turns the wipers off (so that you can stop them at the top of the cycle when you need to change the blades).

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Old Yesterday, 10:36 PM
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Originally Posted by kansas123 View Post
It is a vacuum switch.

By the way, does the switch under the steering column work? The pull down **** on the right side of the large round **** controls the vacuum door: if you pull it down (with the car running), the vacuum door should open and stay open. The round **** turns the wipers off (so that you can stop them at the top of the cycle when you need to change the blades).
Not certain as I have already removed the wiper safety switch. For whatever reason I didn't realize the pull **** on the right moved, I was only aware on the **** to turn off the wipers. Still learning...
does the black **** on the left do anything?
I have had my hands full rebuilding the front suspension and steering componets. Now that that that is done I have finallyt been able to get it on the road and started on other fixes.

Last edited by DC1972; Yesterday at 10:39 PM.
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Old Today, 04:44 AM
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Originally Posted by DC1972 View Post
Not certain as I have already removed the wiper safety switch. For whatever reason I didn't realize the pull **** on the right moved, I was only aware on the **** to turn off the wipers. Still learning...
does the black **** on the left do anything?
I have had my hands full rebuilding the front suspension and steering componets. Now that that that is done I have finallyt been able to get it on the road and started on other fixes.
The black pull **** on the left is the override for pulling the headlights up/open. So that you can adjust them, change the headlights, things like that....
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Old Today, 07:13 AM
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Ok that makes perfect sense. I have ordered the vacuum safety switch, will know I a few days if that is the complete fix or not.
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