Where is the air conditioning port for 2006 Chevy Express 3500?

The air conditioning service port for a 2006 Chevy Express 3500 is located on the refrigerant lines near the engine. The low-pressure service port is typically found on the larger diameter line, while the high-pressure port is on the smaller line. To access these ports, you may need to lift the hood and look near the front of the engine bay, close to the compressor. Always consult your vehicle's service manual for specific details and safety precautions.