Strange issue here.
I had the freon checked and it is full. When I turn the a/c on the electrical
radiator fans turn on and the engine seems to notice the compressor coming on,
but I get no cold air. I can than try again later and the a/c will work just
fine for 20 - 30 minutes than just turns it's self off.
Are there any relays or contacts the are known to have an issue?
Could the evaporator be plugged and a sensor is turning the a/c off?
Grabbing at straws here. Any troubleshooting ideas or suggestions?

Thanks,
Ed