Response to your Q's and update:
The A/C compressor is not cycling on.
The fans are working (both)
The blower fan works
The refrigerant line is not frozen, and not cold at all
Additional - Turned the A/C off and the engine surging stopped. Turned the A/C on, the surging started again plus the Alternator light came on, and the engine stalled. Turned the A/C back off, and the surging stopped and the alternator light went back off.
Additional (2) - Recently (about 4-6 weeks ago), some of these same symptoms came up. I took it to a auto shop where the alternator was replaced, an "engine speed sensor" was replaced, and a small amount of refrigerant added. (I'll have to look at the repair receipt when I get home tonight to let you know the exact name of the sensor).
Correction - NO sensor of any kind was replaced, just new alternator and additional refrigerant. My mistake - sorry.
If the engine drags down and wants to stall every time you turn the a/c on then I suspect your compressor is seized up. It's a tight fit but to check this, with the car off you need to either reach down and try to turn the compressor clutch by hand or use a long object to stick down there and prod at the clutch to see if it spins. If it will not spin then this would confirm that the compressor is seized up. If the compressor is seized up then every time you turn the a/c on it will act like a brake on the belt which is attached to the motor so it in turn acts like a brake on the motor. If the motor is having a hard time turning against this belt resistance then the alternator will not have the rpm's it needs to supply voltage and the motor will have a hard time running.
Thanks for all the info, every little bit helps in diagnosis. Let me think about this and see if I can come up with anything but this may be one of those things where you need to leave your car with a technician until they can duplicate and diagnose it. These sporadic problems can be the most difficult to solve. Often times we are forced to wait until the problem is so bad that it exhibits itself consistently enough to be diagnosed which can of course be frustrating with all of the uncertaintly.