Thanks for the reply, Doc.

I'm 90% sure the WUR is connected but I'll double check it. The RPMs go very high on cold starts and come down to normal when warm, so I'm guessing it's working.

I thought W126s had a separate vacuum system for central locking, with it's own electric pump? Central locking works perfectly on the car.

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1982 280SL - Petrol Green
1994 E420 - Brilliant Silver
1995 E320 wagon - Smoke Silver