The low-pressure AC service port on a 2000 Chevy Cavalier is typically located on the
dryer/accumulator. The dryer/accumulator is part of the AC system and is usually found near the firewall on the passenger side (right side) of the engine compartment. It's often a smaller cylindrical component with several fittings. The low-pressure port will be the smaller of the two ports and usually has a blue cap.
Important Note: It's crucial to be certain you've correctly identified the low-pressure port before attempting any service. Incorrectly connecting to the high-pressure port can be extremely dangerous. If you are not comfortable identifying the ports yourself, take your vehicle to a qualified automotive technician for AC service.
