Where is the port to recharge rear ac in 2000 Cadillac Escalade?

There isn't a separate port to recharge the rear AC in a 2000 Cadillac Escalade (or most vehicles with rear AC). The rear AC is part of the overall vehicle's air conditioning system. To recharge the refrigerant, you'll need to access the low-pressure port located on the vehicle's main AC system, typically under the hood. A professional AC technician will know exactly where this port is located on your specific model. Attempting to recharge the system yourself without the proper tools and knowledge can be dangerous and may void warranties.