Precautions on Servicing A/C System: Piping

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

Fig 1: Identifying Piping (H25 Engine Model)

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Fig 2: Identifying Piping (H27 Engine Model)

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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

8 mm (0.31 in.) pipe: 15 N.m (1.5 kg.m, 11.0 Ib.ft)

16 mm (0.63 in.) pipe: 25 N.m (2.5 kg.m, 18.0 Ib.ft)
Route drain hose so that drained water does not make any contact to vehicle components.