Service Gauge Port Valves
The service gauge port fitting is an integral part of the refrigerant line or component.
- Prior to leak testing, blow air over service gauge port valves to insure an accurate test.
- Special couplings are required for both the high-side and low-side service gauge ports.
- A very small amount of leakage around the Schrader-type valve with the service gauge port valve cap removed is considered normal. Install a new Schrader-type valve core if the seal leaks excessively.
- The A/C 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.
- Follow the procedure and the notes for electronic leak testing. REFER to the appropriate procedure in General Procedures.
| Item | Description | Torque |
|---|---|---|
| 1 | Low-pressure service gauge port valve cap | 7 lb.in (.8 Nm) |
| 2 | Low-pressure service gauge port valve O ring | -- |
| 3 | Low-pressure Schrader-type valve | 16 lb.in (1.8 Nm) |
| 4 | Low-pressure service gauge port valve | -- |
| 5 | High-pressure service gauge port valve | -- |
| 6 | High-pressure Schrader-type valve | 22 lb.in (2.5 Nm) |
| 7 | High-pressure service gauge port valve O ring | -- |
| 8 | High-pressure service gauge port valve cap | 7 lb.in (.8 Nm) |