O-Ring And Refrigerant Connection
WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
The new and former refrigerant connections use different O-ring configurations. Do not confuse O-rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at, or around, the connection.
O-Ring Specifications*
|
Connection type |
O-ring size |
Dmm (in) |
Wmm (in) |
|
|
New |
8 |
6.8 (0.268) |
1.85 (0.0728) |
|
|
Former |
10 |
9.25 (0.3642) |
1.78 (0.0701) |
|
|
New |
12 |
10.9 (0.429) |
2.43 (0.0957) |
|
|
Former |
11.0 (0.433) |
2.4 (0.094) |
||
|
New |
16 |
13.6 (0.535) |
2.43 (0.0957) |
|
|
Former |
14.3 (0.563) |
2.3 (0.091) |
||
|
New |
19 |
16.5 (0.650) |
2.43 (0.0957) |
|
|
Former |
17.12 (0.6740) |
1.78 (0.0701) |
||
|
New |
24 |
21.8 (0.858) |
2.4 (0.094) |
*: Always check with the Parts Department for the latest parts information.
WARNING:
Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.
CAUTION:
When replacing or cleaning refrigerant cycle components, observe the following.
- When the compressor is removed, store it in the same position as it is when mounted on the car. Failure to do so will cause oil to enter the low pressure chamber.
- When connecting tubes, always use a torque wrench and a back-up wrench.
- After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.
- When installing an air conditioner in the vehicle, connect the pipes as the final stage of the operation. Do not remove the seal caps of pipes and other components until just before required for connection.
- Allow components stored in cool areas to warm to working area temperature before removing seal caps. This prevents condensation from forming inside A/C components.
- Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
- Do not reuse the O-rings.
- Apply A/C compressor oil to the new O-rings for installation.
Oil name: ND-OIL8 (DENSO)
- O-ring must be closely attached to dented portion of tube.
- When replacing the O-ring, be careful not to damage O-ring and tube.
- Connect tube until you hear it click, then tighten the nut or bolt by hand until snug. Make sure that the O-ring is installed to tube correctly.
- After connecting line, conduct leak test and make sure that there are no leaks from connections. When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten connections of seal seat to the specified torque.