My Ford F150 a/c was working fine, then one day, only put out hot air. Put gauges on hi & low side of a/c system, and pressures were good. I did add some Freon at first, thinking that this was the problem. On any a/c setting, all I get is hot air. Is there a sensor or door actuator that would cause this sudden loss of heat?

 

If the A/C compressor is running then it must be a door.