Chances are the actuator control is fine and the problem is a cracked (plastic) vacuum hose under the dash or where the supply hose goes throgh the firewall to the engine.
Start the engine and listen for a hissing sound. If you're lucky, you'll be able to hear the leak.
Let me know what you find or if you have other questions.
Joe
Saturday, December 5th, 2009 AT 9:00 PM