Pontiac tempest 1968 Service Manual page 32

CUSTOM A I R C O N D I T I O N I N G
1A-5
I I —*. T O
W CONDENSE!
J-5725-01
^ b s s ^ ^ ^ ^ 2 ^ J " 6 2 7 2
REFRIGERANT-12
valve and valve on refrigerant drum to allow more
refrigerant to enter system. Close valve when re­
ceiver-dehydrator clears up.
NOTE: If air inlet temperature is below 70°F.
when this check is made, bubbles may appear even
though the proper amount of refrigerant is in the
system. Air inlet temperature must be 70°F. or
above to make an accurate check.
8. When refrigerant has been installed, continue
to operate system and test for proper operation as
outlined under OPERATIONAL T E S T .
9. When satisfied that air conditioning system is
operating properly, stop engine, remove gauge set
and replace protective caps on P.O.A. valve and
compressor 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 gauge fitting
at the compressor with a shop cloth before dis­
connecting the Schrader valve from the gauge fit­
ting, to prevent injury to personnel.
10. Using leak detector J 6085, 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 .
F i g . 1 A - 3 Schematic - Charging Refrigeration System
REFRIGERANT-12 DISPOSABLE CAN METHOD
After having depressurized, repaired (if neces­
sary), and evacuated the refrigerant system, the
system may be charged as follows when using Re­
frigerant-12 disposable cans:
1. Obtain four (for Firebird) or five (for Pontiac
or Tempest) "one" pound cans of Refrigerant-12.
2. Mount three cans in J 6272 No. 3 Multi-opener
or attach J 6271 Fitz-All valve (single can opener
valve) on one can.
CAUTION: Make sure outlet valve on opener is
closed (clockwise) before installing opener.
a. If the J 6272 No. 3 Multi-opener is used,
raise locking lever, position three cans of r e ­
frigerant and force locking lever down to secure
cans and at same time puncture top of can to make
it ready for charging.
b. If the J 6271 Fitz-All valve is used, back
off the valve from the can top retainer, slip the
valve on to the can and turn the valve into r e ­
tainer until tight. DO NOT open outlet valve during
this operation as turning the valve into the r e ­
tainer punctures top of can to make it ready for
charging.