Where is low pressure service port for air conditioning system on 2003 Ford F-350 superduty with power stroke 6.0 liter engine?

The low-pressure service port on a 2003 Ford F-350 Super Duty with a 6.0L Power Stroke engine is typically located on the dryer/accumulator. The dryer/accumulator is part of the A/C system and is usually found near the firewall, often on the passenger side. It's a cylindrical component and the low-pressure port is usually a smaller fitting.

However, you should NOT rely solely on online information for this. The exact location can vary slightly depending on the specific vehicle configuration. Consult a repair manual specific to your year and model of F-350. These manuals will have diagrams showing the precise location of all A/C components, including the low and high-pressure ports.

Incorrectly identifying the ports can lead to damage to the A/C system. It's best to be certain before attempting any A/C service. If you are unsure, a qualified mechanic should perform any A/C work.