Are you talikng about the vacuum actuators or about one of the five "famous" valves behind the ACC.
There are places that sell the rubber diaphragm for rebuilding the vacuum control valve that is linked to the flap for vents etc.
The 5 famous valves are about 25 bucks each. I have extensively written with photos about the ACC problem on 1985 300D turbo. Do a search on MVK and ACC. You will get the idea.

Hope this helps.

MVK

__________________
One penny saved is three penny earned.

1985 300D Turbo 179,000miles