On a '68 RS, can any one give me an idea what the most common problem with RS headlights are? I can not get them to close. I am replacing all of the vacuum lines but will probably need to do more. I do not want to go electric conversion as I want to keep the car as stock as possible. Also, any suppliers more trust worthy than the others?
Any help will be appreciated.
ldwood@citlink.net

 

Already answered in your duplicate thread...
I've had my fair share of headlight fixes on the C3 Vettes (fun), and they work off the same principle as your setup. First thing to do is to run a direct vacuum line to the vacuum canister at the headlights (test one end of the can at a time) and see if the doors open and close as they should. A multitude of leaky, or loose fitting vacuum hoses in the circuit can reduce the total amount of vacuum by the time it makes it to the headlight doors. If the direct connection makes them work, start checking all your vacuum hoses, and even cut a little bit of the hose ends off to give them a tight fit again. If the doors are still sluggish, then the problem is at the canister. On the can, there is a collapsible rubber boot ($6.95 part at Classic Industries) that seals between the pushrod and the body of the canister. From age and wear, those boots can get dry, cracked, and split open. If the boot is cracked open, you will lose vacuum and that will make the doors either sluggish or non-operational. Or, the problem could also be the diaphragm inside the canister itself, which would mean replacing the whole thing. Also check to make sure you don't have any physical drag or resistance which could hinder the doors performance.

 

Thanks, I will give that a try and see what happens. I did notknow the first post made it so I did the 2nd one. Have not posted many threads as you can tell.

 

I agree dirt. Check all those rubber hoses before moving on to the reservior and pump. The smallest leak will affect the whole motion of the doors. A real pain. Good luck!