My 93 Cabriolet, has AC and after I got it repaired last week, I notticed that when I tuen on the fan on the AC settings, the RPMs stay at the same level, around 900rpm. before I got the AC fixed, the RPMs will rise up to 1200rpm. I asked the mechanic and he is playing dumb. Do you gusy know where can I check, or where can I increase the RPMs. Thank you