perfect..hook everything back up and at the actuator letter H in the diagram ( It is probably in behind the passenger side fender down near the eggcrate vents), unplug the black and white hose K coming from the door closed switch letter C and check the vacuum at that with the switch off and on. It should pull a vacuum if the operating system is not leaking which it should be fine. If it isnt bypass letterC and seee if the system works. If it does then that is one of your problems

If it is fine then reconnect it and make sure the yellow line going in isnt leaking. Then put a gauge on the red and the green hoses. as you switch from open to closed youwill see the vacuum transfer from hose to hose. If that is bad then then the actuater controller H is leaking which they do often.

When you get the door openning and closing with out the headlights winking then you can figure out the wiper motor.

 

I editted the last post , please recheck it for corrections

 

OK RR , After locating the actuator and checking for vacuum with switch on and off . How should I turn switch on and off? Do you me at the wiper switch on dash or manually at C. Thanks

 

My bad, i meant the wiper switch. Run the engine and see what you have with the wiper system operating. I am trying to see where the vacuum is an issue and where the various safeties and interlocks could be an issue. If that valve is getting vacuum to it then everything in the wiper switch part of the system is functioning. If that valve is leaking then your vacuum signal will be low or non existent on one side and strong on the other. Just after that is the actuator valve which tends to fail and leak through the servo (Linear valve) and out the vent.

The issue we have is the system up and failed and affected both the wiper door and the headlights. That is obvioiusly a vacuum problem. You have shown the headlights arent the issue so we can concentrate on the wiper door side. Affecting the headlights means its a vacuum problem but since the door isnt moving at all, the wiper switch and the other vavles and relays that the switch operate need to be checked as they could have failed just by coincidence

 

Thanks for your suggestion. Unable to pull vacuum on 1 or 2. Serious vacuum leak. Next I'm going to do what Rescue Roger has directed me to do. Thanks for the help.

 

If you dont have good vacuum through switch c, here is the test

http://repairs.willcoxcorvette.com/1...e-valve-works/

 

If you dont have good vacuum through switch c, here is the test

http://repairs.willcoxcorvette.com/1...e-valve-works/

 

OK, RR I pulled the B&W line had vacuum , on and off with switch. Next I have to test the red and green hoses. Do I need to put a vacuum gauge on each hose or can I hook both with a "T" connector (have only 1 gauge at the moment) Thanks

 

there will be vacuum at one hose or the other depending on whether the door is supposed to be openning or closing. When you turn on the wipers you will feel the vacuum going through one of the hoses, just plug in the gauge and see what you are getting, then do the other side. If you have the valve out in the open you can listen to see if there is vacuum leak there.

How is the vacuum source on the yellow line?

The yellow line vacuum reading is what you will be seeing on the red or green line. The black/ white line controls which line is getting the vacuum

 

Did you have vacuum at the black and white line whether your wiper switch was turned on or off? It should have no vacuum with the switch on then vacuum as the switch is turned off. t. Thats controlled by the servo on the tachometer A

 

Can't remember off or on but the vacuum did shut off and then on. Just can,t remember if switch was on or off. Will double check in the morning.

 

if it cycled then the switch on the tach is working. Im betting the linear actuator is probably leaking.

 

Checked B&W hose at actuator and vacuum shut on and off with switch. Checked red and green hose and vacuum transferred from one to the other. Also vacuum transferred from port to port on actuator. Next isolated "C" ,full vacuum to actuator nothing happened.

 

It sounds like you have good vacuum at F and G,correct? And your feeling vacuum change from F to G at the relay valve (H) when you turn on the wipers with the wiper switch, correct?

Switch C vents the vacuum once the wipers are moving to ensure the door stays open. Once the wiper stop and park on C it sends vacuum to the relay valve(H) so that it can close the door and the constant vacuum ensures it stay shut. if you hook everything up the door still isnt opening correct?

Hook everything back up and start the motor
If you pull on bypass E the door should open. with all the correct vacuum signals the door actuator on the fire wall that F and G plug into should be moving.
. If all these things are correct then possibly the actuator on the fire wall is leaking or seized. You can unplug both hoses f and g, and use the mighty vac to pull a vacuum on the door side pulling the piston towards the windshield and openning the door and see if it moves with vacuum.

Theres a black plug on the end that should pull off easily to get let you push the piston rod inside to push the wiper door open, Once that door is all the way open the wipers should start moving. You should use a squirt bottle to keep the blades wet when you test this part.

It sounds like the good news so far is that your wiper system switches, vacuum relays are working properly. If the door acuator doesnt move that may be the problem and its creating the leak that slows the headlights down.

 

Vacuum at F & G OK Tried to pull vacuum on door side - no go Pushed actuator and door opened- wipers came on. Thanks for tip water on windshield. Actuator Bad? The one now was replaced 10yrs or so ago.

 

If it wont hold a vacuum at all its probably bad. I dont think they can be rebuilt easily. Try pulling a vacuum on each side incase I got the connections wrong. If you hook it straight to a vacuum source like hose 2 at the 3 end, can you hear a leak? If its bad it should solve your problems. It may have dry rotted from no use and just sitting.

At least you know the wiper system functions too.

 

I switched them around when tested first time. I'll give it the leak test next. Thanks

 

I bet you found your problem. Good luck, keep us posted.

 

If it isn't i'll have another spare part. I will post results.

 

So it openning and closing slowly would lead to a leak on the working side. So go back to the diagram, if you have another T, plug 3, 4 and 5 into it an bypass the tank and see if the doors open with the engine running. Then shut the wipers off with the doors running. See if it shuts normal. When you shut off the engine you will get an abrupt stoppage of vacuum so with the tank bypassed things will act weird, so ignore that.