I think this is the double-canister just above and to the right of the accelerator. DO check this one first, as I found this to be my problem AFTER I replaced the center vent canister by removing the dash.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Lee Einer Sent: Wednesday, January 04, 2006 7:06 PM To: Mercedes Discussion List Subject: Re: [MBZ] Center A/C Vents ...If memory serves, there is a cannister up under the dash on the driver's side which is also involved in passing vacuum to the center vent cannister, and it may this one which is leaking