The low-side AC service port on a 2003 Dodge Ram 3500 is typically located
on the drier/accumulator. This component is usually found
near the compressor, on the firewall side of the engine compartment. It's a smaller port, often blue, compared to the high-side port (usually red).
However, the exact location can vary slightly depending on the specific engine and options on your truck. It's always best to consult a repair manual specific to your 2003 Dodge Ram 3500 to get the precise location. A diagram will show you exactly where to look.
