What could be wrong when freon is good but blowing warm in front and back. on 1999 GMC Yukon

Freon level is good, clutch is operational. But do not have any service lights on.

Asked by for the 1999 GMC Yukon
We offer a free AC system diagnosis with any paid service, or if you have the needed repair done with us. Diagnostics normally start at about $50.00. We are located in south Scottsdale if you would like to have it looked at. or 480-421-9048