My 69 wiper door stays open all the time. engine running and engine off.  Could it be the check valve?  Thanks, Bob

Its been a while since I worked on mine but yes that could be one problem. It could also be a vacuum hose or there are vacuum actuators in the system as well if I remember. I have a troubleshooting guide at home if I can find it but I wont be there until late Sunday night. Shoot me an email to remind me to look for it and I will see if I can help.

Thanks for the info.