I just troubleshot the vacuum in my CD and found everything working OK except the vacuum elements in the seats which was a silly design idea to begin with..I don't know if you have these seat elements but as soon as I closed them off my vacuum system started working just fine..Just a suggestion...

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83 300CDTurbo 307,000
2005 Honda Element 266,000
56 Nash Ambassador Country Club Special 34,000(under restoration presently)

http://www.peachparts.com/shopforum/showthread.php?t=125099