Whats wrong with my HVAC system? Help

Black1987Stang

Active Member
Aug 22, 2004
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Jersey Shore
A while ago I noticed after I turn the engine off I still had control of my vacuum air damn motors for a few seconds, I could hear them go PPSSHHHHH, CLUNK and all the noises of the motors operating. Now they dont do anything, all the vacuum is lost as soon as I turn the engine off. According to this diagram it looks like my check valve is bad or leaking? http://www.veryuseful.com/mustang/tech/engine/images/Mustang_AC_heat_vacuum_controls.gif

What do u think :SNSign: