Service Port HVAC: Description and Operation

Air Conditioning

Service Gauge Port Valves

The high-pressure service gauge port valve is located on the receiver/drier inlet line.

The low-pressure service gauge port valve is located on the evaporator outlet line.

NOTE: Different valve cores are used for different engine applications. Use only the valve core listed in the Ford Catalog Advantage(TM) or equivalent for the vehicle and fitting being serviced.











The fitting is an integral part of the refrigerant line or component.

- Special couplings are required for both the high-side and low-side service gauge ports.
- A very small amount of leakage will always be detectable around the Schrader-type valve with the service gauge port valve cap removed, and is considered normal. A new Schrader-type valve core can be installed if the seal leaks excessively.
- The service gauge port valve caps are used as primary seals in the refrigerant system to prevent leakage through the Schrader-type valves from reaching the atmosphere. Always install and tighten the A/C service gauge port valve caps to the correct torque after they are removed.