Service Port HVAC: Description and Operation

Service Gauge Port Valve:

The high-pressure service gauge port valve is located on the front A/C manifold and tube.

The low pressure service gauge port valve is located on the suction accumulator/drier.

The fitting is an integral part of the refrigeration line or component.
^ Special couplings are required for both the high-side and low-side service gauge ports.
^ A new Schrader-type valve core can be installed if the seal leaks.
^ Always install the A/C charging valve cap on the service gauge port valves after repairing the refrigerant system.