Tyme143

Hello Chevy uplanders enthusiast I'm trying to locate the low charging port for the AC unit so I can recharge the freon. Thanks in advance.

oilcanhenry

It will be on the low-side of the AC system, which is the larger of the lines going into the evaporator (your heater box inside the cabin) or condenser which is the high-side and uses a smaller line and mounted if front of the radiator.
Some vehicles have a light blue cap L-P cap on them, the high side might have a red one. If your system is at atmospheric pressure, you have a big-leak and it will need to be repaired and the atmo vacuumed down to -30 PSI for at least a half an hour, but I will assume its just lost a bit of R-134A.as all AC systems leak a bit of R-134A over a few years
If you are using the cans of refrigerant at the auto parts store. you cant make a mistake as the low-side charge port is larger then the high-side port. Also you might consider using a can of R-134A green UV leak detector, not leak sealant, which is bad news. If you ever have a leak it can be seen with UV googles. Good luck to you! (and please wear eye and hand protection)