Where is the ac low side for 92 Chevy van g20?

The AC low side service port for a 1992 Chevrolet G20 van is typically located on the larger diameter aluminum line that runs between the evaporator and the compressor. This port is usually near the compressor, towards the front of the engine bay. It is often covered by a plastic cap labeled with an "L" for low side. Always ensure the system is off and properly depressurized before attempting any service.