Pontiac tempest 1968 Service Manual page 33

1A-6 1967 P O N T I A C S E R V I C E M A N U A L
3. Connect center flexible line of gauge set to
fitting on a can opener valve.
NOTE: If line at center gauge fitting has not been
purged of air, loosen line at center fitting on gauge
set and "crack" valve at can opener (for a second
or two) to force air from the line. Re tight en line at
center fitting.
4. Open valve on No
0
3 Multi-opener (or on single
can) and also low pressure and high pressure valves
on manifold gauge set. Leave can valve open until all
refrigerant has entered the refrigeration system.
Close valve on can.
a. If the system is charged using single cans
and the J 6271 valve, disconnect valve from can,
leaving valve closed to flexible line to the center
fitting of the manifold gauge set. Install valve on
a new and full disposable can of Refrigerant-12,
and repeat until four and one quarter one pound
cans of refrigerant have been used to charge
system.
Actual net weight of refrigerant is 15 ozs. per
can, therefore it will be necessary to use four and
one-third cans for Pontiac or Tempest, four cans
for Firebird.
b. If system is charged using the 3 can Multi-
opener, J 6272, close the valve of opener after all
cans are empty. Release the locking lever and dis­
card the three empty cans. If this tool will be
used to complete the charge with additional cans
to bring the required refrigerant charge, then
leave two of the cans emptied in position, locate
the one full can and lock the lever into place.
(These empty cans balance the assembly and pre­
vent the loss of refrigerant out the open "series*'
passage.)
NOTE: Align the pierced hole in the empty can
with the punch in the cover of the tool.
If the J 6271 Fitz-All valve for single cans is
available, complete charging as explained in 4a
above.
5. Close valves on manifold gauge set.
6. Operate engine at 2000 rpm with temperature
control knob at full cold position and blower control
for high speed in A / C mode.
NOTE: If air inlet temperature at the condenser
is below 70°F. when this check is made, bubbles
may appear even though the proper amount of re­
frigerant is in the system. Air inlet temperature
must be 70°F. or above to make an accurate check.
7. When refrigerant has been installed, continue to
operate system and test for proper operation as out­
lined under OPERATIONAL T E S T .
8. When satisfied that air conditioning system is
operating properly, stop engine, remove gauge set
and replace protective caps on suction and discharge
fittings.
NOTE: A considerable amount of refrigerant will
collect in the high pressure line, since some of
this refrigerant will have condensed into liquid
refrigerant. Wrap the high pressure fitting at the
compressor with a shop cloth before disconnecting
the Schrader valve from the gauge fitting to pre­
vent damage or injury to personnel.
9. Using leak detector J 6084, check complete
system for leaks as e x p l a i n e d under L E A K
D E T E C T O R S .
SERVICE STATION METHOD
INSTALLING J 8393
1. Be certain compressor hand shut-off valves
are closed to gauge fittings (counterclockwise).
2. Be certain all valves on charging station are
closed.
3. Connect high pressure gauge line (with J 6163
attached) to compressor high pressure gauge fitting.
4. Turn high pressure hand shut-off valve one turn
clockwise, and high pressure control (2) one turn
counterclockwise (open). Crack open low pressure
control (1) and allow refrigerant gas to hiss from low
pressure gauge line for three seconds, then connect
low pressure gauge line to low pressure gauge fitting
on P.O.A. valve. (Place J 6163 adapter on hose, then
attach adapter to gauge fitting.)
FILLING CHARGING CYLINDER
1. Open control valve on refrigerant container.
2. Open valve on bottom of charging cylinder al­
lowing refrigerant to enter cylinder.
3. Bleed charging cylinder to valve (behind con­
trol panel) only as required to allow refrigerant to
enter cylinder. When refrigerant reaches desired
charge level (4 1/8 or 3 3/4), close valve at bottom
of charging cylinder and be certain cylinder bleed
valve is closed securely.
NOTE: While filling the cylinder, it will be nec­
essary to close the bleed valve periodically to
allow boiling to subside so that refrigerant level in
the charging cylinder can be accurately read.
CHARGING THE SYSTEM USING J 8393
1. With charging station installed as previously