Mamock's Motor Electric, in Annapolis, on Legion Avenue, down from the Post Office, is very good on auto AC and electrical problems. They are also extremely good on Toyotas. So far, I have had my 280SL, 3.5 cab, 6.3 (all AC problems) serviced there. Also 280GE (clutch & TO bearing), trans mount, some other odds and ends, and my classic Mini-Cooper (rear brakes, front end). They are a small shop but are very smart and able to figure things out- the specialize in AC and electrical work. Owner was a Toyota Master Tech for years, co-owner loves old MB cars. The also rebuild any kind of starter or alternator/generator you can think of, and do a lot of electrical rebuilds for local boaters as well.