Subaru XT 1988 Service Manual page 1035

AIR CONDITIONING SYSTEM 4-7
CD
®
Cap
2 Service valve
3 Charging hose
2
4 Packing
5 Check valve
Close
A26-029
Fig. 9
Handling can tap
A wide variety of can taps are available. The following pro-
cedures apply to conventional can taps.
For the correct usage, refer to the manufacturer's instruc-
tions.
CAUTION:
Use can tap of good quality.
1) Connect charging hose to the center fitting of manifold
gauge. At this time, confirm that both stems are fully turned
in (front-seated).
2) Turn can tap handle fully counterclockwise so that the
needle is pulled up.
3) Attach can tap to refrigerant can firmly.
4) Turn can tap handle fully clockwise to make a hole in
refrigerant can.
5) Turn the handle fully counterclockwise to raise the
needle. Refrigerant gas will flow up to the center fitting of
manifold gauge.
6) Loosen the connection at the center fitting of manifold
gauge for a few seconds to purge air inside charging hose.
(Clockwise)
(Counterclockwise)
n
n
®
-
Can tap handle
2 Charging hose
3 Needle
4 Refrigerant can
A26{) 30
Fig. 10
Purging air
R-12
A26{)31
Fig. 11
Discharging system
The pressurized refrigerant gas inside system must be dis-
charged to a pressure approaching atmospheric pressure prior
to evacuating refrigerant inside system. This operation should
be made to permit safe removal when replacing system com-
ponents.
1) Close high- and low-pressure valves of manifold gauge
fully.
2) Connect two charging hoses of manifold gauge to their
respective service valves.
3) Open both manifold gauge valves slightly and slowly
discharge refrigerant from system.
Do not allow refrigerant to rush out Otherwise, compressor
oil will be discharged along with refrigerant.
13
L4491
Fig. 12
CAUTION:
When connecting the charging hose to the service valve or
disconnecting
it
therefrom, protect your fingers against frost-
bite by using gloves or other cloth material.
Evacuating system
1) Connect high- and low-pressure charging hoses of mani-
fold gauge to their respective service valves of system and