Cheers sixto, will take a look tomorrow to see if tank is fitted - the system is not pressurizing so i do suspect a leak somewhere, just can't place where it might be given the pipe routing.

Forgot to mention, no a/c fitted.

Ref thread for research:

300SDL leaking cooling from expansion tank

Courtesy of above thread, wonder if this is it?

__________________
David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)