Please! I'm aware of the EPA rules on this and I don't want to start a debate, but I'd be interested to hear if anyone has had a positive/negative experience with HC refrigerants. Also, Are there any good horror stories out there regarding AC repairs? I've heard of insane amounts of money being spent in pursuit of a cooler ride in these cars. Summer has arrived and I'm looking for an honest mechanic to getthe AC in my '91 300E ingood working order. It's never been converted and I'm scared to death of the potential cost.