Cadillac 60 Series 1963 Shop Manual page 407

13-26
HEATING AND AIR CONDITIONING
All components of the Air Conditioner system
are shipped dehydrated and sealed. They are to
remain sealed until just prior to making connec-
tions and should be at room temperature before
uncapping to prevent condensation of moisture
from the air that enters the component. They
should not be uncapped any longer than necessary
to make a connection.
All precautions should be taken to prevent dam-
age to the fitting and connections. Any fittings
with grease or dirt on them should be cleaned
prior to assembly, using a clean cloth dipped in
alcohol. If dirt, grease or moisture gets inside
lines and cannot be removed, lines may have to
be replaced.
All blue O-rings for making closures for ship-
ment should be discarded and new black O-rings
used for making final refrigerant connections.
Use a small amount of refrigeration oil on all
tubes and hose joints and lubricate the O-rings
with this oil before assembly. Always slip the
lubricated O-ring onto the flange tube to insure
proper locating and sealing.
All O-ring connections should be tightened with
torque wrenches and a crowfoot wrench (used at
a 90° angle to the torque wrench for accurate
reading), in accordance with the following table.
Note that the torque specified for aluminum or
copper tubing is less than that specified for steel
tubing.
Metal
Tube
O.D.
(In Ins.)
1/4"
3/8"
1/2"
5/8"
3/4"
Thread
and
Fitting
Side
(In Ins.)
7/16"
5/8"
3/4"
7/8"
1-1/16"
Steel
Tubing
Torque
Ft. Lbs.
15
35
35
35
35
Alum, or
Copper Tubing
Torque
Ft. Lbs.
7
13
13
21
28
Nominal
Torque
Wrench
Span
(In Ins.)
5/8"
3/4"
7/8"
1-1/16"
1-1/4"
If a connection is made with steel to aluminum
or copper, use torques for aluminum. In other
words, use the lower torque specification. Use
steel torques only when both ends of connection
are steel.
Backing wrenches of the required size must be
used during the final tightening of all O-ring and
flare-type connections.
15. Maintenance and Inspection
a. Preliminary Check
1. Check air gap between frictional surfaces of
pulley and clutch plate. Air gap should be approx-
imately 1/32 inch-1/16 inch (.031 inch-.O62 inch).
2. Check drive belt tension and adjust if nec-
essary. See Note 30.
3. Observe clutch to make certain that it is
engaging and disengaging.
4. If there is evidence of oil leaks, leak test
entire system and make necessary repairs. See
Note 17.
5. Check sight glass for full charge of re-
frigerant. If system is low, leak test and make
necessary repairs. See Note 17.
NOTE: It is normal for some foaming to
occur in the sight glass with an outside air
temperature of 70°F or below.
6. Add refrigerant as necessary, see Note 24,
and repeat leak test of system.
7. Check operation of blower in all positions.
8. Check for air leaks through dash panel and
through heater doors.
9. Turn system on and check operation. If
cooling efficiency is doubtful, conduct performance
test. See Note 18.
b. Seasonal Operation
The Air Conditioner system should be turned
on several times a month throughout the winter.
Running the unit periodically for a few minutes at
a time, helps lubricate compressor seals and
bearings and prevents loss of refrigerant.
Before starting the Air Conditioner for regular
use after the winter season, perform the following
operations:
1. Check drive belt tension and adjust if nec-
essary. See Note 30.
2. Observe clutch to make certain it is engaging
and disengaging.
3. Check sight glass for full charge of refrig-
erant. If system is low, leak test and make nec-
essary repairs. See Note 17.
4. Add refrigerant as necessary, see Note 24,
and repeat leak test of system.
5. Check operation of blower in all positions.
6. Turn system on and check operation. If
cooling efficiency is doubtful, conduct perform-
ance test. See Note 18.
16. Maintaining Chemical Stability
The efficient operation of the Air Conditioner
system is dependent on the pressure-temperature
relationship of pure refrigerant 12. As long as