I have a 1971 corvette
I can not get the wiper door to close. it opens OK. only way to get it to close is to use the manual override swith.
I was told the issue could be with a windshield wiper solinoid door actuator.
I have taken the dash out and can not locate the part. I was told it has 3 vacuum lines running from it, and 2 electrical wire connectors.
Did the 1971 models have this part, and if so where is it located on a 1971 model?

 

Yes, it is on a bracket connected (screwed) to the back of the tachometer. If I remember correctly there are only two vacuum lines to it one of the tubes is for a filter. http://www.zip-corvette.com/ProductD...GR-SR&CTitle=&

 

Hi t,
Rocco's info is right on.
The solenoid controls the vacuum signal to the wiper vacuum relay... 'open' or 'close'.
The plastic nipple at the end is the one that doesn't get a vacuum hose.
Good Luck!
Happy New Year!
Regards,
Alan

 

Thanks for the feedback on the location, does anyone have a picture showing which hoses go to the actuator? or can tell me where they go to?
A photo would be great if possible.

Thanks again for the help,

 

The lines that connect to the actuator come from the vacuum relay located on the firewall for non A/C cars and on the inter wheel well of the passenger side on A/C cars large red line to the front of the actuator and large green to the back.

 

Thanks for picture, helps a lot.
could you please advise what wire goes onto the right side terminal.
please advise color of eire
thanks

 

Hi t,
I believe the wire connector can be put on either way.
I see you're a new member; I don't know if the car is new to you or not.
I'll encourage you to buy the 71 ASSEMBLY INSTRUCTION MANUAL (AIM) and the 71 GM CHASSIS SERVICE MANUAL. they both are full of the information you'll be looking for as you work on your car. They're available from the larger vendors and are WELL WORTH the $$.
Regards,
Alan

 

on the back of the wiper door control solinoid is two plastic connectors. I understand vacuum hose with green line coes to one. can someone tell me which one is used for this hose connection

 

Is it possible that your wiper door vac switch on the firewall is bad? Mine was and it did the same thing until I replaced it. Its the switch on the firewall that the wipers come to a rest on, the door isnt supposed to close until that switch is depressed by the wipers.

 

Hi T,
A small white stripe hose, (vacuum supply), come through the firewall to a plastic tee, a short hose from the tee runs to the metal nipple on the end of the solenoid can. The other nipple on the plastic tee has a hose that continues to the rear nipple on the headlight switch.
The plastic nipple perpendicular to the solenoid receives the white stripe hose coming from the lower nipple on the wiper door override valve under the steering column.
Regards,
Alan

 

I think maybe some of the terminology maybe getting you a little sideways
note the diagram in Wilcox's post in the link perhaps it will help some.

http://forums.corvetteforum.com/c3-g...per-doors.html

 

Hi Trigga

Good information from the other guys, but one thing seems odd to me:

In your first post you say that you can only get the viper door to close by using the manual override switch. I don't know if it's a typo, but the override switch only opens the wiper door (sounds silly, explanation will follow). If the wiper door won't close activating the override switch shouldn't change anything. What I mean is if an error in the rest of the system causes the door to stay open the override switch has no function.
Maybe the two thick hoses going from the relay to the actuator are switched?

P.S. The override switch is activated by pulling out. In normal operating mode the override is pushed in (just wondering...)

 

Hi DS,
Good Point!
Or..... maybe the 2 hoses running to the over-ride valve are switched?
Regards,
Alan

 

Could someone please tell me what wire goes on the connector on the bottom of the tacho ? and what this does? Also I have re installed my dash, and have no illumination (lights) on the left speedo? , however the tacho lamps work fine, My clock has also stoped working after re-installing, what would stop it working?
please help
thanks

 

The wire at the bottom shown in Alan's picture is a ground for the speedo and tach.

The bottom line to figuring out what is causing problems in the vacuum system is starting at one point and moving backwards until you find the issue. With the schematic below you'll get a better grasp of what is going on.

The default of both the headlamp and the wiper door system is open under failure. No vacuum on the control side makes things happen. Thus, pulling the over-ride (blocks vacuum) to make the door open.

Below I start out with Relay point F. I do this because this is the end of the line. No vacuum there means mover inward. if you have vacuum there then you have another issue on the function side (large hoses).

Here is a copy of the post referenced above:

The motor starts running when you pull up the motor because the plunger on the limit switch is compressing the switch. This allows voltage to pass to the motor and allows it to run. This is part of the fail safe system created by the plunger. In other words on all cars 69-72 for the motor to run the door must be open.

Below is the schematic of the system... it should help you understand what is going on. I would start a the relay F and see if you have vacuum on the yellow hose and the smaller black with a white strip hose.

You can pull off the yellow hose and use it to test the actuator for proper function too. You do this by removing the red hose from the actuator and putting the yellow one on it.

go to this link and you'll understand how the relay works... just click on supporting documentation.

http://willcoxcorvette.com/repairand...lp.php?hID=218