My Nissan's AC just stopped working. I checked Freon which the gauge said it was fine and didn't need recharged. You can hear the AC clutch engaging when you turn the AC on but still blows hot air no matter what. You can hear the radiator fan start spinning as well. The fuse inside the cabin was fine as well. Everything under the hood seems to be working find. Things spin when they should etc. Trying to figure out what it is before taking it somewhere. Thanks in advance.

You probably have a bad Mix Actuator, the motor which controls the blend of hot and cold air coming through the vents. IIRC it's behind the glove box on a B17 Sentra with Manual A/C.