Larry,
thanks for the response.
car is 1985 380sl.
it was never converted so i am dealing with r-12.
from the directions in the cd shop manual, it seems the car was built around the evaporator.
does your response still hold (to charge with nitrogen and few ounces of r-22)? i have a battery operated electronic leak detector. can i purchase a pressurized canister of nitrogen and r22 at the local automotive store or pep boys?
Jack