Serves as a purge valve for the vac line coming off the thermo valve on the cylinder head and eventually ending up at the throttle housing. I believe the correct part number is 107-470-08-93, but you should confirm with the dealer or Internet vendor.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't