Where is ac recharge port 98 gm 2500 pickup?

The AC recharge port on a 1998 GMC 2500 pickup is typically located on the low-pressure side of the AC system. You can find it near the accumulator or receiver-drier, usually on the larger diameter line that runs from the compressor. It's generally marked with a blue or black cap and is designed for the attachment of the refrigerant recharge hose. Always ensure the engine is off and the AC system is not under pressure before attempting to recharge.