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Where is the low side ac port for a 2003 Lincoln LS V8?

The low-side AC port on a 2003 Lincoln LS V8 is typically located on the dryer/accumulator. The dryer/accumulator is usually found near the firewall, on the passenger side of the engine compartment. It's a cylindrical component with several fittings. The low-side port is usually smaller than the high-side port.

Important Note: It's crucial to visually identify the ports. The low-side port will have a smaller diameter fitting than the high-side port. Incorrectly identifying the ports can cause serious damage to your AC system. If you're unsure, consult a repair manual specific to your vehicle or take it to a qualified AC technician.