Subaru B9 TRIBECA WX 2007 Manual page 494

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5. O-RING CONNECTIONS
• Always use a new O-ring.
• In order to keep the O-rings free of lint which can
cause a refrigerant gas leak, perform operations
without gloves and cloth.
• Apply compressor oil to O-rings to avoid sticking,
before installation.
• Use a torque wrench to tighten the O-ring fittings.
Over-tightening will cause damage to the O-ring
and cause tube end distortion.
• If the work is interrupted before completing pipe con-
nections, recap the tubes, components and fittings with a
plug or tape to prevent foreign matter from entering.
(A)
(A) Seal
• Visually check the surfaces and mating surfaces
of O-rings, threads and connecting points. If a fail-
ure is found, replace the applicable parts.
• Install the O-rings at a right angle to tube beads.
(A)
(B)
(C)
(C)
(A) O-ring
(B) OK
(C) NG
(D) Groove
General Description
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
• Use compressor oil specified in the service man-
ual to lubricate the O-rings.
Apply oil to the top and sides of O-rings before in-
stallation.
Apply compressor oil to grooves of the tube.
• After tightening, use a clean cloth to remove ex-
cess compressor oil from the connections and any
oil which may have run on the vehicle body or other
parts.
• If any leakage is suspected after tightening, do
not tighten the connections further, but disconnect
the connections, remove the O-rings, and check
the O-rings, threads, and connections.
AC-00008
D: PREPARATION TOOL
CAUTION:
When working on vehicles with a HFC-134a
system, only use HFC-134a specified tools and
parts. Do not mix CFC-12 tools and parts. If
HFC-134a and CFC-12 refrigerant or compres-
sor oil is mixed, it will result in poor lubrication
and the compressor itself may be damaged.
In order to prevent the mixture of HFC-134a and
(D)
CFC-12 parts and liquid, the tool and screw
type and the type of service valves used are dif-
ferent. The gas leak detectors for the HFC-134a
and CFC-12 systems must also not be inter-
changed.
AC-00009
Tool & screw type
Valve type
AC-15
AC-00010
HFC-134a CFC-12
Millimeter size Inch size
Quick joint type Screw-in type