Subaru 2009 IMPREZA, Service Manual

Page: 2703 / 3619

AC-23
Refrigerant Charging Procedure
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
5) Perform evacuation for 5 minutes or more, and
when the low pressure gauge needle reaches –
100.0 kPa (–750 mmHg, –29.5 inHg) or higher,
close the center manifold hose valve, and stop the
vacuum pump.
6) Leave alone for 5 to 10 minutes after closing the
low pressure side and high pressure side valves,
and check whether there is any change in the low
pressure gauge needle indication. If the needle po-
sition changes, this indicates a leak. Check the
pipe and hose connections, and repair the location
with the problem. In this case, repeat again from
step 1).
7) If there is no leakage, continue evacuation for
additional 20 to 30 minutes.
8) Close all valves and stop the vacuum pump.
9) Follow the can tap operation manual, install to
the refrigerant can.
10) Disconnect the center manifold hose from the
vacuum pump, and connect the hose to the tap
valve.
11) When a 13.6 kg (30 lb) refrigerant container is
used, measure the amount of refrigerant with a re-
frigerant charging scale, and connect with the cen-
ter manifold hose.
12) Open the valve on the HFC-134a source.
13) Loosen the center manifold hose connection on
the manifold gauge for a few seconds (if there is a
purge valve on the manifold gauge, push this in-
stead) to allow the air in the center manifold hose to
escape using the refrigerant pressure.
14) Open the high pressure side and low pressure
side valves of the manifold gauge to fill with refrig-
erant.
CAUTION:
When filling with the engine running, do not
open the high pressure side valve. Always fill
from the low pressure side.
15) When the gauge needle reaches approximate-
ly 200 kPa (1,500 mmHg, 59.1 inHg), close all
valves.
16) Using a leak tester, check for refrigerant leaks
in the system.
17) After checking that there are no refrigerant
leaks, fill with refrigerant up to the specified
amount.
18) If the HFC-134a supply container becomes
empty, close all valves, and close the can tap valve
to replace the empty container. After replacing with
a new HFC-134a supply container, perform air
purge, and resume the filling operation.
19) If the refrigerant filling efficiency drops, close all
valves.
20) Check that both the low pressure and high
pressure valves are closed. Start the engine with
the A/C switch OFF.
(1) Tap valve
(2) To the center manifold hose
(1) Refrigerant container (HFC-134a)
(2) Weight scale
AC-00214
(1)
(2)
AC-00215
(1)
(2)
(1) Open
(2) Open
AC-00216
AC-00217
(1)
(2)