Special Tool(s) / General Equipment
Forming Gas Pressure Gauge and Leak Detector |
Materials
Name | Specification |
---|---|
Forming Gas | - |
Leak detection
All vehicles
NOTE: Use a Rotunda-approved Forming Gas A/C System Dealership Leak Detection Service Kit that meets SAE J2790.
Recover the refrigerant. Refer to the appropriate Recovery procedure in Group 412.Hybrid\Electric vehicles
All vehicles
![]() |
NOTICE: Make sure that the pressure reducer (2) is closed.
![]() |
NOTE: Forming gas is lighter than air, and tends to move up from the source of the leak. It is possible that a leak may not be detected if the leak detector tip is held below the leaking fitting, line or component. Always be sure to thoroughly leak test below, above and around the fitting, line or component.
Disconnect the forming gas pressure gauge and leak detector from the air conditioning system in accordance with the manufacturer instructions.NOTICE: Do not ever recover the forming gas into the A/C recovery/charging machine.
NOTE: Discharge the H2/N2 gas into the atmosphere after the system leak/s are located.
Charge the system with the appropriate refrigerant only after the leak/s are repaired and retested with the H2/N2 gas and the model D740 leak detector. Refer to the appropriate Recharging procedure in Group 412.Check
NOTE: Wheel-to-hub optimization is important. Clearance between the wheel and hub can be used to offset or neutralize the Road Force® or run-out of the wheel and tire assembly. For every 0.001 inch of wheel-to-hub clearance, the Road Force® can be affected between 1 and 3 pounds depending on the tire stiffness.
NOTE: The example below illustrates how the clearance between the wheel and the hub can be used to offset the high spot of radial run-out or Road Force®. Following the procedure will make sure of the best optimization.
Position the wheel and tire assembly on the vehicle so that the high spot location of radial run-out or Road Force® is at the 6 o'clock position and