High Pressure Safety Valve HVAC: Service and Repair

Relief Valve Replacement:

1. Remove the relief valve and O-ring.
Don't let any refrigerant oil run out.

NOTE: Be sure to use the right O-rings for R-134a.

2. Clean off the mating surface.
3. Replace O-ring with new one at the relief valve, and apply refrigerant oil (ND-OIL 8) to it.

NOTE:
- Do not return the oil to the container once dispensed and never mix with other refrigerant oils to avoid contamination.
- Immediately after using the oil, replace the cap on the container and seal it to avoid moisture absorption.
- Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately.

4. Install and tighten the relief valve.
5. Charge the system and check for leaks.