27 degrees is too hot for an airconditioner. I won't really do anything.

In an automatic climate control system. You tell it to go AUTO but you are still in charge of selecting the temp you want. Comfortable cabin temp is usually in the 24-26 degree area. Select that and your a/c system should fire up the fan if you left the vehicle parked in the open sun. It will retard fan speed once set temp is reached.