Service Port HVAC: Description and Operation

Service Gauge Port Valve:

The high-pressure gauge port valve is located on the condenser to evaporator line.

The low-pressure gauge port valve is located on the A/C manifold and tube assembly.

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