Precautions on Servicing A/C System: Piping

When connecting hoses and pipes, apply a few drops of refrigerant oil to seats of coupling nuts and O-ring.

Fig 1: Applying Refrigerant Oil To Seats Of Coupling Nuts & O-Rings
Courtesy of SUZUKI OF AMERICA CORP.
Never use heat for bending pipes. When bending a pipe, try to make its bending radius as slight as possible.
Keep internal parts of air conditioning free from moisture and dirt. When disconnecting any line from system, install a blind plug or cap to the fitting immediately.
When tightening or loosening a fitting, use two wrenches, one for turning and the other for support.
Tighten flared nuts to specified torque.
Tightening torque

8mm pipe: 13 N-m (1.3 kg-m, 9.5 lb-ft)

12.7mm pipe: 22 N-m (2.2 kg-m, 16.0 lb-ft)

14.5mm pipe: 23 N-m (2.3 kg-m, 16.6 lb-ft)

16mm pipe: 33 N-m (3.3 kg-m, 23.8 lb-ft)
Route drain hose so that drained water does not make any contact to vehicle components.