Chrysler Conquest 1988 Service Manual page 959

AIR CONDITIONING
- Service Adiustment Procedures
24-83
When a DR6148 compressor is installed at the factory, it
contains 170 ml of refrigerant oil. While the air conditioning
system is in operation, the oil is carried through the entire
system by the refrigerant. Some of this oil will be trapped
and retained in various parts of the system.
When the following system components are changed, it is
necessary to add oil to the system to replace the oil being
removed with the component.
Compressor: 115 cc (3.9 fl.oz.)
Condenser: 25 cc (0.8 fl.oz.)
Evaporator: 35 cc (1.2 fl.oz.)
Line: 15 cc (0.5 fl.oz.)
Receiver drier: 0 cc (0 fl.oz.)
EVACUATING THE SYSTEM
Whenever the system has been ,opened to the atmosphere, it
is absolutely essential that the system be evacuated or
"vacuumed" to remove all the air and moisture. Air in the
refrigerant system causes high compressor discharge pres-
sures, a loss in system performance, and oxidation of .the
compressor oil into gum and varnish. Moisture in the re-
frigerant system can cause the expansion valve to malfunction.-
Under certain conditions, water can react with the refrigerant to
form destructive acids. It is necessary to adhere to the
following procedure to keep air and moisture out of the system.
(1) Install manifold gauge set. Make sure the gauge set valves
are closed before attaching the hoses to the refrigerant
system.
(2) Discharge the system slowly if the manifold gauge set
indicates pressure in the system.
(3) Connect a long test hose from gauge set manifold center _. - .
connection to vacuum pump.
(4) Open both manifold gauge set valves.
(5) Start the vacuum pump and operate until the evaporator
suction gauge registers at least -101 kPa (29.9 in. of I
vacuum).
If at least -101 kPa (29.9 in. of vacuum) cannot be obtained,
either the system has a leak or the vacuum pump is
defective. Check the vacuum pump. If the pump proves to
be functioning properly, the system has a leak. Charge the
system with one can (14 oz.) of refrigerant. Locate and
repair all leaks. Discharge the refrigerant and evacuate the
system.
(6) Continue to operate the pump for at least five minutes.
(7) Close manifold valves. Turn off the vacuum pump and
observe evaporator suction gauge for two minutes. The
vacuum level should remain constant.
If the vacuum level falls off, the system has a leak.
Charge the system with one pound of refrigerant. Locate
and repair all leaks. Discharge the system and repeat
evacuation procedure.