Subaru IMPREZA GD 2007 Series Manual page 3912

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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 will
cause a refrigerant gas leak, perform work without
using gloves or waste cloths.
• Apply compressor oil to O-rings to avoid sticking,
before installation.
• Use a torque wrench to tighten the O-ring fittings.
Over-tightening will result in damage of the O-ring
and deformation of the tube end.
• If the operation is interrupted before completing
a pipe connection; recap the tubes, components
and fittings with a plug or tape to prevent dirt 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 straight against the groove of
the tube.
(A)
(B)
(C)
(C)
(A) O-ring
(B) OK
(C) NG
(D) Groove
General Description
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
• Use oil specified in the service manual to lubri-
cate the O-rings.
Apply oil to the top and sides of O-rings before in-
stallation.
Apply the oil to the O-ring and end of the tube.
• After tightening, use a clean cloth to remove the
excess 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 further tighten the connections, but disconnect
the connections, remove the O-rings, and check
the O-rings, threads, and connections.
D: PREPARATION TOOL
AC-00008
CAUTION:
• When working on vehicles with 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 compressor 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 CFC-12 parts and liquid, the tool and screw
type and the type of service valves used are dif-
(D)
ferent. The gas leak detectors for the HFC-134a
and CFC-12 systems must also not be inter-
changed.
Tool & screw type
Valve type
AC-00009
AC-15
AC-00010
HFC-134a CFC-12
Millimeter size Inch size
Quick joint type Screw-in type