My '89 300E of course has a leak in the evaporator, sniffer notices R12
coming out of vents, and there are probably some other leaks as well. I
plan to convert to 134a. First I want to see how bad the evaporator leak is
though.... if it's not 'too bad' I might simply be able to charge once a year
or so before summer.... will see. What changes do I need to make before
having the shop charge system with 134a. Is pumping out and using the
appropriate oil enough? or do I need to change some o-rings etc as well?
I know it won't work that well but, hey, here in Ontario a little cooling is
often all that is needed. Has anyone done the conversion?