Hey blackmercedes (John) ... I took the car back to the dealership today ... they were not able to find anything wrong with the ac. Its cooling at 55 - 60 degrees on "LO" and they checked the ACC PBV readings to find that they were all normal -- very odd. I showed them the codes that I pulled and deleted to make the ac work again and they had no real explanation for what happened.

Oh well it seems okay for now ... now on to search this site and/or start a new thread to find information on the second problem that occurred immediately after leaving the dealer -- the check engine light came on. They pulled the codes and found that the diagnostic module reported a bad left rear O2 sensor!

Hey thanks again for the info/education ... and now back to the search page!

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1998 Black/Black C280 Sport w/ 81,000 miles