Where is the low pressure port on a 2004 Mercury sable?

On a 2004 Mercury Sable, the low-pressure port for the air conditioning system is typically located on the larger diameter aluminum line that connects the compressor to the evaporator. It is usually found near the front of the engine compartment, close to the firewall. Look for a service port with a plastic cap, often labeled with an "L" or blue color. Always ensure the engine is off and the system is properly handled when working with AC components.