Where is the low pressure AC hookup on a 2001 2500 HD 6.0?

On a 2001 Chevrolet 2500 HD with a 6.0-liter engine, the low-pressure AC service port is typically located on the larger diameter aluminum line that runs from the compressor to the evaporator. You'll find it near the front of the engine compartment, often close to the passenger side. The port is usually covered by a plastic cap and is designed to accept a specific AC recharge fitting. Always ensure the vehicle is off and properly cooled down before attempting to access the AC system.