Confusing A/C question

[jimmyb.1]

Hi, I have a 93 camry, 2.2L auto w/ 212K miles on it. Just recently the A/C will stop cooling but after the engine has been off for a while upon start up the A/C will be really cold. It's R12 and I've toped it off w/ Freeze 12 over the years when it's needed. The sight glass is clear. Usually have cold air on a cool engine.

Today the car was parked in 85 degree sun and I drove 2hrs w/ no A/c. I could feel the compressor kicking on when I'd push the button but no cold air. After parking it in the shade for a couple of hours I drove home (the sun was still hot but not as much) w/ ice cold A/C. I checked the sight glass once I got home and it was clear. It's like something electrical is shorting out when the motor is hot but yet I think the compressor is still running.

Please give me some ideas. Could it be internal wiring on the compressor?
Thanks for any help. Jim

[Stillrunning]

Either the compressor is running or not, if it's not then no cold air. Check the compressor belt tension. Compressor clutch could be kicking out. Check pressures.