I posted a couple of weeks ago and now have gone through all of those suggestions and everything else I could think of.
My '72 wiper door comes open after you start the engine and will not go shut (other than manually closing it after you shut off the car).
The wipers work, and the manual override valve below the drivers side dash is closed. I have even taken the wiper switch out of the circuit by unplugging it. Today I (and i don't know which side goes where), I reversed the two vacuum lines that attach to the wiper door solonoid on the back of the tach.
My understanding of the circuit is that when the wiper switch is "on", it energizes the relay on the back of the tach and lets vacuum to the actuator? Or vacuum to the actuator by using the bypass valve under the dash. The solonoid on the back of the tach is a 3 wire plug (I think) and one side of the solonoid has two nipples and the other side has one. I assumed that the spare nipple has nothing attached and that is the bleed off allowing the wiper door to close? I will say the vacuum is low to the actuator as the door only partially opens and not with much authority.
My next step is (I suppose) to disconnect the plug from the solonoid on the back of the tach to see if it still opens. If it does, I have eliminated the electrical components of the circuit, right? I suppose it is possible that the solonoid is stuck on? or the plug to it is on backward? Why is it a 3 prong flat plug? is it not just an on off or is there something still that I am missing? And if it still opens without the solonoid engaging, then it has to just be a vacuum issue somewhere?
All thoughts appreciated...my head is sore from beating it uselessly against the firewall And of course all of this stuff is really hard to "get at"...

 

I dont know if this has been covered previously but there is a vacuum switch out on the cowl that the pass. side wiper arm contacts that has something to do with the wiper door opening and closing. Trying hard to remember what I did way back when my '71 was giving me fits about the wiper door, wound up replacing that vacuum switch/plunger and it cleared up the problem,,,mabe it got out of adjustment on you somehow,,,,,,,good luck, Peace,,,Moosie

 

I guess the reason I'm focusing under the dash is that it worked correctly before I tore out the interrior restore the old girl. I have not touched anything under the hood (that I know of)... but I'll double check !!! Thanks for the help.

 

does your actuator have vac.anytime?

 

i guess i don't know for sure, but it must be getting vac to open the door, right?

 

Mine used to magically open after I shut the car off.....with help of Dr. Rebuild's little wiper troubleshooting guide I was able to trace it to that little vacuum shuttle valve under the right hand wiper arm. Have had zero problems since replacing it.

 

Sorry I meant the little hose--with the engine running put some vacumn on the little tube---use mouth or vac from dist.adv. or vac pump