Cadillac 60 Series 1963 Shop Manual page 412

HEATING AND AIR CONDITIONING
13-31
10. Repeat steps 4 and 5.
11. Repeat step 7.
12. System is now ready for complete charge of
refrigerant as described in Note 23.
22. Checking Refrigerant Charge
Bubbles in the sight glass do not always indicate
that the system is low on refrigerant. If the sys-
tem is at a control point, bubbles may also
appear in the sight glass even though the system
is fully charged.
A certain amount of foaming is also normal
with an outside air temperature of 70°F or below.
Check refrigerant charge at the sight glass and
proceed as described below to make certain that
system is not at a bubble producing control point.
1. Connect Charging Station low pressure line
to gage fitting on suction throttling valve.
2. Run engine at 1500 rpm for 5 to 7 minutes,
with Air Conditioner operating at maximum cool-
ing, to stabilize system.
3. Observe low pressure reading, which also
indicates suction throttling valve setting. Low
pressure gage should r e a d approximately 30
pounds.
4. Slow down engine until low pressure gage
reads 33 to 35 pounds.
5. Maintain engine speed at this level, wait
several minutes and then observe sight glass.
a. If a solid column of refrigerant appears in
sight glass, it is an indication that charge in sys-
tem is adequate or overcharged.
b. If bubbles appear in sight glass, it is an
indication that system is low on refrigerant. Add
refrigerant to system as described in Note 24.
23. Adding Refrigerant with
Charging Station, J-8393
(Complete Charge)
1. Evacuate system as described in Note 21.
It is vitally important that the system be properly
evacuated.
2. Fill cylinder on Charging Station with refrig-
erant as follows:
a. Open valves on refrigerant drum and bottom
of cylinder (valve 4 must be closed).
b. Open valve on top of cylinder until proper
liquid level is obtained in sight tube. (4 pounds
for all except 75 series - 5-1/4 pounds for 75
series).
3. Fully open valves 2 and 4 to allow refrig-
erant to flow into system.
NOTE: If refrigerant does not flow freely
into system, it is probably due to valve cores
in compressor fittings not being depressed far
enough. If this condition exists, try another
Gage Adapter, J-5420, or build up an adapter
depressor tongue with solder to depress valve
core further.
4. After liquid refrigerant has stopped flowing
into high pressure side of system, close valve 2.
5. Start engine and run at approximately 1500
rpm with shift lever in "Neutral" position. Move
upper Air Conditioner lever to "Cool", lower
lever to extreme left position, and turn fan switch
to "High".
6. Open valve 1 (valve 4 must also be open).
This will allow refrigerant remaining in cylinder
to be pulled into system.
NOTE: Since capacity of Charging Station
cylinder is only 5 pounds, additional refrigerant
will have to be added to cylinder when charging
75 series cars, due to the 5-1/4 pounds charge
required.
7. Shut off engine, close all valves, disconnect
Charging Station high and low pressure lines from
compressor, and replace caps on fittings.
24. Adding Refrigerant with
Charging Station, J-8393
(Partial Charge)
Refrigerant can be added to the Air Conditioning
system using Charging Station, J-8393. It is im-
portant that the charging lines be purged before
any refrigerant is added.
1. Connect Charging
Note 20.
Station as described in
NOTE: Purge air from Charging Station high
and low pressure lines before connecting. To
purge lines, crack open valves 1, 2, and 4,
making certain that there is some refrigerant
in cylinder, then install lines and close valves.
2. Operate engine at 600 rpm with shift lever
in "Neutral" position. Move upper Air Condi-
tioner control lever to "Cool", lower lever to
extreme left position, and turn fan switch to
"High".
3. Fill cylinder on Charging Station with 2 to 3
pounds of refrigerant, as follows:
a. Open valves on refrigerant drum and bottom
of cylinder (valve 4 must be closed).