My AC is blowing air that is barely cooling the car. I need to get the system checked so would you guys recommend that I take it to a MB indy shop or would it be safe to take it to one of the chain stores? I patronize a good local indy shop but their rates are $98/hr. so I was wondering if an AC would be routine for a chain store like Firestone Complete Auto Care.

P.S. My car is a 1988 with 104K miles. At 55K miles approx. five years ago the sys was evacuated/recharged. The compressor was rebuilt.

Thanks.