Pontiac FIREBIRD 1972 Service Manual page 122

CUSTOM AIR CONDITIONING 1A-63
3. If the amount of oil drained in step 1 is less than 1
1/2 ozs. and/or the system appears to have lost an
excessive amount of oil:
Disconnect the expansion valve outlet connection
(evaporator inlet).
Plug suction line connection at P.O.A. valve out-
let.
Disconnect oil bleed line at P.O.A. valve, using
care not to damage line.
Connect a cylinder of refrigerant regulated to not
exceed 125 psi to this oil bleed fitting to force any
retained oil from the evaporator out the evapora-
tor inlet fitting. (Reverse flush the evaporator.)
Catch any oil reverse flushed in this manner. If oil
flushed from the system appears clean, install new
compressor with 6-7 ounces of oil.
4. If oil drained in step 1 contains any foreign material
such as chips, or there is evidence of moisture in the
system, replace the receiver-dehydrator assembly and
flush all component parts or replace if necessary.
After flushing refrigerant system in this manner, the
full oil charge (1
1
02s.) should be left in the new
service compressor.
COMPRESSOR REMOVAL
1. Connect the high and low pressure gauge lines from
the gauge set to the respective connections on the
P.O.A. valve and compressor. Disconnect thermal
limiter connector and jumper terminals B and C. Be
sure valves on gauge set are fully clockwise to close
gauge set to center fitting and that a J 5420 or J 9459
adapter is between the low pressure hose and suction
gauge fitting and also at the discharge gauge fitting.
2. Remove the flare nut from center connection on
gauge manifold or the plug in the gauge line attached
to the center connection. Wrap the line at the outlet
with a cloth to protect personnel and car surfaces
from oil or refrigerant.
3. Depressurize refrigeration system.
4. After the system is completely depressurized, very
slowly loosen screw which retains compressor fittings
assembly to compressor (Figs. 1A-54 thru 1A-57). As
screw is being loosened, work fittings assembly back
and forth to break seal and carefully bleed off any
remaining pressure.
discharge fitting. If this pressure is released too
rapidly, there will be a considerable discharge of
refrigerant and oil.
I
@
17-25 LB. FT.
REFRIGERANT LEAKS MAY OCCUR
I F SEQUENCE IS NOT FOLLOWED.
LCOMPRESSOR
MOUNTING BOLT
Fig. 1A-54 B Series Muffler and Compressor Fittings Assembly