Subaru 1600 Service Manual page 572

HEATING, VENTILATING AND AIR-CONDITIONING SYSTEM
Check item
Amount of
refrigerant
Almost no refrigerant Insufficient Suitable
Too much refrigerant
f - - - - - - - - - - - " " > \ - - - - - - - - - + - - - - - - - - + - - - - - - - - - + - - - - . --.--.... ---
Temperature of high pressure
and low pressure pipes.
State in sight glass.
Almost no difference
between high pressure
and low pressure side
temperature.
Bubbles flow continu-
ously. Bubbles will
disappear and
something like mist
will flow when
refrigerant is nearly
gone.
High pressure side is
warm and low pressure
side is fairly cold.
The bubbles are seen
at intervals of 1 - 2
seconds.
High pressure side is
hot and low pressure
side is cold.
Almost transparent.
Bubbles may appear
when engine speed is
raised and lowered.
High pressure side is
abnormally hot.
No bubbles can be seen.
No clear difference exists between these two
conditions.
Fig. 13-64
A26-042
Fig. 13-65
A26-043
Fig. 13-66
A26-044
Pressure of system. High pressure side is
abnormally low.
Both pressure on high
and low pressure sides
are sligh t1y low.
Both pressures on high
and low pressure sides
are normal.
Both pressures on high
and low pressure sides
are abnormally high.
Repair. Stop compressor and
conduct an overall
check.
Check for gas leakage,
repair as required,
replenish and charge
system.
NOTE:
a. The bubbles seen through the sight
glass are influenced
by
the ambient
temperature. Since the bubbles are
hard to show up in comparatively
low temperatures below 200C
(68°F), it is possible that a slightly
larger amount of refrigerant would
be filled, if supplied according to
the sight glass. Be sure to recheck
the amount when it exceeds 20°C
(68°
F).
In higher temperature the
bubbles are easy to show up.
b. When the screen in the receiver
drier is clogged, the bubbles will
appear even if the amount of refrig-
erant is normal. In this case, the
outlet side pipe of the receiver drier
becomes considerably cold.
Perfonnance test
Check for the amount of refrigerant
in the system can be made by meas-
uring pressure on discharge side.
The correct amount of refrigerant is
in the system, if pressure on the dis-
charge side is within the specified
range. For details, refer to "Perform-
ance Test" described later.
13-27
Discharge refrigerant
from service valve of
low pressure side.
Overcharging will show up in higher
pressure on discharge side.
9) Compressor Oil Level Check
The oil used to lubricate compres-
sor circulates into system with refriger-
ant gas while compressor is operating.
If a considerable amount of leakage of
refrigerant gas happens, the leakage
of compressor oil is also considered.
There will be no compressor oil leak-
age from a completely sealed system.
When system operates under satisfying