99MBSport

I have been having a problem with the AC recently. When it is above 90ish outside my AC Compressor will not kick on when the car is first started up. If I run it for a while and park.(shut off ignition) It will then kick on when I restart. I thought maybe low freon, but that was checked and all is good there. Can there be a simple solution or will this be a $$ pit? thanks for any ideas.