Where is the valve to add a/c refrigerant? on 1998 Chevrolet Lumina

Asked by for the 1998 Chevrolet Lumina
2 answers
Under the front of the driver side fender.... Laying on the ground, look up.... See that silver colored can type thing?.... The port is on that part! Yep it's a pain in the a..!
under the air filter box the smaller line is highside and the larger one is lowside the one u add refrigerant to is lowside, just remove the air box with a screwdriver