Chrysler Conquest 1988 Service Manual page 951

AIR CONDITIONING
- Service Adjustment Procedures
24-75
2OY 1638
TESt PROCEDURES
N24FEAD
RECEIVER DRIER
The receiver drier assembly consists of; Drier reservoir,
Refrigerant level sight glass and Fusible plug.
To Test the Receiver Drier
(1) Operate the unit and check the piping temperature by
touching the receiver drier outlet and inlet.
(2) If there is a difference in the temperatures, the received
drier is restricted.
Replace the receiver drier.
SIGHT GLASS REFRIGERANT LEVEL TEST
The sight glass is a refrigerant level indicator. To check the
refrigerant level, clean the sight glass and start the vehicle
engine. Push the air conditioner button to operate the com-
pressor, place the blower switch to high and move the
temperature lever to extreme left. After operating for a few
minutes in this manner, check the sight glass.
(1) If the sight glass is clear, the magnetic clutch is engaged,
the compressor discharge line is warm and the compressor
inlet line is cool; the system has a full charge.
(2) If the sight glass is clear, the magnetic clutch is engaged
and there is no significant temperature difference between
compressor inlet and discharge lines; the system has lost
some refrigerant.
(3) If the sight glass is clear and the magnetic clutch is
disengaged; the clutch is faulty or, the system is out of
refrigerant. Perform low pressure switch test to determine
condition. Check low pressure switch, and clutch coil for
electrical continuity.
(4) If the sight glass shows foam or bubbles, the system could
be low on charge. Occasional foam or bubbles are normal
when the ambient temperature is above 43°C (110°F) or
below 21°C (70°F).
Adjust the engine speed to 1,500 rpm. Block the air flow
thru the condenser to increase the compressor discharge
pressure to 1,422 to 1,520 kPa (206 to 220 psi). If sight
glass still shows bubbles or foam, system charge level is
low.
The refrigerant system will not be low on charge unless
there is a leak. Find and repair the leak. If the leak can be
repaired without discharging the system an oil level check
is not necessary. Use the procedure for correcting low
refrigerant level found in the Refrigerant System Service
Procedure Section.
FUSIBLE PLUG
In 105°C (221°F) ambient, the fusible link melts and the '
refrigerant in the system is discharged.
Once the fusible link has melted, it cannot be reused.
Therefore, install a new fusible link and charge the system with
refrigerant.