air worked all day got home shut truck off 2 hours later started truck back up and the air does not work.is there any type of fuse or relay i can check put a tester on line and seems to be full of freon.got under truck clutch turns freely but wont engage when pressing switch to air.anybody help with this

 

sometimes in the afternoon mine will blow nice and warm air and I just cycle the snowflake switch or turn the thermostat up to hot and then back down to cold and i can damn near transport sides of beef in the passenger seat.

Hope its something as simple as this for you.