Actually I took the car to the dealership with a working AC to get sched b service and it came back not working, blowing hot air and a memory full of error codes. I pulled the codes using Charles' method, wrote them down and deleted them. I turned the car off and then back on and the AC is working ... it seems cold but it seems as though it has been cooler in the past. Is it possible that in the process of doing a schedule b maintenance the mechanic might have jarred something loose causing this to happen?

Option number 2 makes sense ... the only continuous error code was 241 which, correct me if I'm wrong may be refrigerant refill - the code didnt have any other numbers or letters in front of it as seen on the chart in Steve's article.

No my car isn't under Starmark.

I still have cool air in the car but I don't know for how long and again it seems as though it was cooler in the past.

Thanks for the RIGHT way to gather ACC PBU readings ... makes a whole lot of sense!

If you can think of anything else I would appreciate the suggestions!

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