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Old 12-22-2002, 06:06 PM
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Join Date: Aug 2002
Location: Milwaukee, WI
Posts: 126
O Wise (Wo)Men - 90 300SEL Vacuum Line Identification

Oh boy, got the two-post life installed yesterday (quite easy) and got the Mercedes overhead. Found a few things to tend to.

One thing I spotted while inspecting engine bay: on the passenger side, there is a nylon (white with red and blue stripe) vacuum line that was hanging down around the emissions air pump. It looked 'normal' from the topside, but underneath I could see it wasn't connected to anything. One end is connected to a solenoid on the passenger side inner fender (inside engine compartment). There are two of those solenoids in that location, and this one is the one most toward the front of the car. The dangling end has a rubber connecter, but I could not find any place it should fit. All other ports/lines seem connected.

Anyone identify this line and coach me where it belongs?


JP Rodkey
90 300 SEL
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Old 12-22-2002, 08:34 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
If you follow the output hose on the airpump, there is a valve in the middle. Most likely, this vacuum line goes there.
Donnie Drummonds
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Old 12-24-2002, 03:17 PM
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Join Date: Aug 2002
Location: Milwaukee, WI
Posts: 126
Thanks very much - that was indeed the connection.
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