Just FYI, I'm not talking about "moisture", I'm talkng about "liquid refrigerant".

Moisture in the system can cause problems, but unless the system has been discharged and/or opened, its pretty much impossible for moisture to ingress.

But the compressor pumps liquid refrigerant to the expansion valve in the evaporator, and then the refrigerant expands and boils off, (that's what creates cooling) and returns to a gas.

But if the low (return) side pressure/temperature is too low, the refrigerant won't completely return to a gas, and any liquid returing to the compressor will destroy the compressor.

The temp and pressure switches cycle the compressor on and off, which both maintains a near-constant evap temp, and protects the compressor.

Normal. A/C clutch is disengaged when over a certain throttle %

Interesting thanks.

Older cars used Freon and that will produce a cooler temperature than the environmentally safe R134a that's put in modern cars.