RE part number you asked for in your other thread:

Bosch 0280140017 MB 0001410325

There are repair discussions on Benzworld 107 forums in stickies. Do a search and you will find them. For start wash the valve in solvent then Simple Green or similar and cycle it back & forth with hot/cold water until it it moves and is closed at 150F

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5