Service Gauge Port Valves
The service gauge port valve 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 port valves.
- 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: Electronic Leak Detection .
| Item | Description | Torque |
|---|---|---|
| 1 | Low-pressure service gauge port valve cap | 0.8 Nm (7 lb-in) |
| 2 | Low-pressure service gauge port valve | - |
| 3 | Low-pressure Schrader-type valve | 2.26 Nm (20 lb-in) |
| 4 | High-pressure Schrader-type valve | 3.4 Nm (30 lb-in) |
| 5 | High-pressure service gauge port valve | - |
| 6 | High-pressure service gauge port valve cap | 0.8 Nm (7 lb-in) |