Prolly. There is a spring in the relay valve that keeps the valve in the open position(the "at rest" position). The vacuum is supposed to keep the valve in the closed position with the engine running, but, if there is a vac. leak, or the relay valve is leaking/bad, it can/will allow the vac to go to the open port of the relay valve, opening the wiper door when the engine is off. Try pinching off the vac line(center hose) at the actuator before turning the engine off. If the door stays down then, you'll prolly need either the check valve, or possibly the relay valve.

As an alternative, you could always duct tape a brick to the door to hold it down... Adams' Apple2008-04-05 19:40:38

As an alternative, you could always duct tape a brick to the door to hold it down...
He is never short of ideas, is he?

Thank you MR. Apple for your prompt and pertinent advise on my current situation. However..........by now you gentlemen must know that I am a very sensitive and serious person and "can not" accept your joking at my expense. Besideswhere in the world would I EVER find Arrest Me Red duct tape???

Home Depot has it...I have a roll meself...my cars are red too, ya know...

For a more flush look - use 3"deck screws in the wiper door corners- you can paint them to match the door color

[QUOTE=apasbigal]For a more flush look - use 3"deck screws in the wiper door corners- you can paint them to match the door color [/QUOTE]

I like the 5 1/2 carrage bolt - with crome

Enough of this nonsense - why won't anybody post the real answer? The obvious answer is to have the person in the passenger seat drape themselves over the windshield and hold that sucker down. Depending on the passenger, you may get even more waves....