thats possible, but in either case, i still have to take the dash off, right?

the shop did a nitrogen test, they loaded up the system to operating pressure with nitrogen so they could see the leak. but since you cant really see the evaporator, it could be a connection.

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1991 300 D 2.5 Turbo, 220k
also in the family:
1981 240 D 185k
1991 350 SD 185k
2006 S 500
2005 SLK 350