Subaru XT 1988 Service Manual page 1040

4-7
• Pipe connections
• Service valve
(4) Evaporator housing
AIR CONDITIONING SYSTEM
REFR IGERANT LEVEL CHECK
Sight glass
•
• Inlet and outlet pipe connections
Sight glass is provided at the top of receiver drier. One guide
for whether there is enough refrigerant in system is given by
observing refrigerant flow through sight glass. However, this
method is unsu itable for judging the amount of refrigerant.
The correct refrigerant level can be judged by measuring the
system pressures in accordance with the procedures as de-
scribed "Performance Test".
• Expansion valve
Electric leak detector
For the operational procedures, refer to the instructions
furnished with each electric leak detector.
Temperature of high pressure
and low pressure pipes.
State in sight glass.
Pressure of system.
Repair.
Almost no refrigerant
Almost no difference
between. high pressure
and low pressure side
temperature.
Bubbles flow continu-
ously. Bubbla will
disappear and
something like mist
will flow when
refrigerant is nearly
gone.
1) Start the engine and hold engine speed at 1,500 rpm.
2) Turn on AIC switch. -
3) Set blower to maximum speed.
4) Check sight glass after the lapse of about five minutes.
Judge according to the following table.
Insufficient
High pressure side is
warm and low pressure
side is fairly cold.
The bubbles are seen
at intervals of 1 - 2
seconds.
Suitable
High pressure side is
hot and low pressure
side is cold.
Almost transparent.
Bubbles may appear
when engine speed is
raised and lowered.
Too much refrigerant
High pressure side is
abnormally hot.
No bubbles can be seen.
No clear difference exists between these two
conditions.
A26~42 A2~3
A26-044
Fig.
22
Fig.
23
High pressure side is
abnormally low.
Stop compressor and
conduct an overall
check.
Both pressure on high
and low pressure sides
are slightly low.
Check for gas leakage,
repair as required,
replenish and charge
system.
18
Fig.
24
Both pressures on high
and low pressure sides
are normal.
Both pressures on high
and low pressure sides
are abnormally high.
Discharge refrigerant
from service valve of
low pressure side.