Cadillac 60 Series 1963 Shop Manual page 413

13-32
HEATING AND AIR CONDITIONING
b. Open valve on top of cylinder until proper
liquid level is obtained in sight tube.
c. Close valve at bottom of cylinder.
4. Open valves 1 and 4. Watch sight glass until
solid column of liquid appears, then close valves.
NOTE: It is normal for some foaming to
occur in sight glass with an outside air tem-
perature of 70°F or below.
5. After five minutes of operation, check sight
glass again. If no bubbles appear, open valves 1
and 4 and add another 1/2 pound of refrigerant.
6. If bubbles appear, repeat steps 4 and 5.
7. Shut off engine, close all valves, disconnect
Charging Station, and install gage fitting caps.
25. Adding Oil
The six-cylinder compressor uses 525 viscosity
refrigeration oil. An oil charge of 10-1/2 fluid
ounces is required on 60 and 62 series cars, and
13-1/2 fluid ounces on 75 series cars. It is im-
portant that only the specified type and quantity
of oil be used in the compressor. If there is a
surplus of oil in the system, too much oil will
circulate with the refrigerant, causing the cooling
capacity of the system to be reduced. Too little
o i l will result in poor lubrication of the
compressor.
When it is necessary to replace a component of
the refrigeration system, certain procedures must
be followed to assure that the total oil charge in
the system is correct after the new part is on the
car. When the compressor is operated, oil grad-
ually leaves the compressor and is circulated
through the system with the refrigerant. Even-
tually a balanced condition is reached in which a
ceetain amount of oil is retained in the compres-
sor and a certain amount is continually circulated.
If a component of the system is removed after the
system has been operated, some oil will go with
it. To maintain the original total oil charge it is
necessary to compensate for this by adding oil to
the new replacement part.
The procedures for adding oil are as follows:
a. Compressor only
1. Idle engine for 10 minutes at 1000-1500 rpm
at maximum cooling and high blower speed to
allow oil to distribute itself in system in a normal
manner.
2. Remove compressor from car and place it in
a horizontal position with drain plug downward.
Drain oil, measure, and discard it.
3. Drain oil from compressor that is to be in-
stalled in car.
4. If oil drained in Step 2 is more than 4 fluid
ounces, add to new compressor the same amount
of oil as drained from replaced unit.
5. If the oil drained in Step 2 is less than 4
fluid ounces, add 6 ounces of oil to new
compressor.
b. Replacing Components
Whenever replacing a component of the Air
Conditioner system, measured quantities of 525
viscosity refrigeration oil should be added to the
component to assure that total oil charge in sys-
tem is correct before unit is operated.
Oil should be added to replacement components
as indicated below.
Evaporator
(Front or Rear)
Condenser
Receiver
Condenser and
Receiver Assembly
- Add 3 fluid ozs.
- Add 1 fluid oz.
- Add 1 fluid oz.
- Add 2 fluid ozs.
Oil should be poured directly into the replace-
ment component. If an evaporator is installed,
pour oil into inlet pipe with pipe held vertically
so oil will drain into core.
If any other components, such as valves or
hoses are replaced, no additional oil is necessary.
c. Compressor and Components
NOTE: If system has., been operated and
there is evidence of a major loss of oil, system
has probably lost all or most of its refrigerant.
If any refrigerant remains, discharge it from
system. Do not operate compressor any more
than is absolutely necessary to avoid damage
from lack of oil.
1. Remove compressor and place in a hori-
zontal position with drain plug downward. Drain
oil from compressor, measure it, and then dis-
card it.
To promote draining have suction connector
open and tilt compressor as required.
2. Replace damaged component from which the
oil was lost.
3. If more than 4 fluid ounces of oil was drained
from compressor in Step 1, add same amount of
new oil to compressor, plus an amount to com-
pensate for that in damaged component, per table
above.