1969 Corvette windshield wiper door problem

Can anyone help - I have a SB 1969 corvette and the wiper door does
not stay closed when I turn the car on. The lights are fine so there
is no vacuum problem there. It's just the wiper door which slowly
opens when car is started. Before I start replacing the wiper door
actuator and the vacuum canister (although I believe this part should
be good since the lights stay down fine) where should I look? If I get
a vacuum tester, what should I start checking first - the hoses?

I think I'd start looking at control valves, maybe one has a slow leak.
You determined there's vacuum in the system, and since the door opens
then its actuator and such are in working order. Those eliminated, the
slow opening suggests a leaky valve to me.



wrote:
> Can anyone help - I have a SB 1969 corvette and the wiper door does
> not stay closed when I turn the car on. The lights are fine so there
> is no vacuum problem there. It's just the wiper door which slowly
> opens when car is started. Before I start replacing the wiper door
> actuator and the vacuum canister (although I believe this part should
> be good since the lights stay down fine) where should I look? If I get
> a vacuum tester, what should I start checking first - the hoses?