Removing And Installing Compressor; Installing Compressor - Pontiac Grand Prix Service Manual

CUSTOM AIR CONDITIONING lA-9
less than 4 ozs., replace into the compressor 6 fluid ozs.
of clean oil, plus the amount shown above for the
respective component replacements.
4. Replace compressor and system components.
5. Evacuate, charge and perform operational test.
REMOVING AND INSTALLING
COMPRESSOR
The compressor, when removed, must be closed
immediately. If the system has been or can be
operated for more than two minutes, circulation of oil
from compressor to other compoiients of system will
require adjustment of the oil charge in the new
compressor as explained above, under REPLACING
COMPONENTS OTHER THAN COMPRESSOR.
After draining and measuring the oil from crankcase
and head of the compressor removed, amount that has
migrated to other parts of the system can be deter-
mined by subtracting the amount drained from the
original oil charge of 11 fluid ozs. The amount of oil
equal to this loss shall be drained from the new
compressor before it is installed.
INSTALLING COMPRESSOR
After idling compressor (on car) to be replaced for 10
minutes at 1500-2000 engine rpm, at maximum
refrigeration and blower at high speed: DO NOT add
any more oil to the compressor than is necessary or
maximum cooling will be reduced.
1. Compressor replaced with new compressor.
a. Remove compressor and place in a horizontal
position with drain plug downward, drain compressor,
measure quantity of oil drained and then discard it.
b. Drain oil from replacement compressor and save it.
c. (1) If amount of oil drained in 'a' is more than 4
ozs., place into the new compressor the same amount
of oil drained from the replaced compressor.
(2) If amount of oil drained in 'a' is 4 ozs. or less, place
6 ozs. of oil in the replacement compressor.
d. Install compressor.
2. Compressor replaced with a field repaired (over-
hauled) compressor.
a. Proceed as in section 1 above, and then add one
extra oz. of oil. (More oil is retained in a drained
compressor than one that has been rebuilt.)
REPLACING AN INOPERATIVE COMPRESSOR
In the case when it is not possible to idle the
cornpresser to be replaced to effect oil return to it, the
following will apply. (DO NOT add any more oil than
is necessary or maximum cooling will be reduced.)
1. Remove compressor from car, drain and measure
the oil.
2. If amount drained i n "1" above is more than 1-1 /2
fluid ozs. SUBTRACT this amount drained from the
original oil charge of 11 ozs. to obtain "oil loss". Take
new compressor assembly and drain from it the
amount of "oil loss" above; (provided the refrigeration
system shows no evidence of a major leak, indicating
that little or no oil has been lost from the system.
Minor leak indicating very slow leakage.)
3. If the amount drained in "1" above is less than 1
1/2 ozs. of oil and/or system appears to have lost an
excessive amount of oil then:
a. Disconnect the expansion valve outlet connection
(evaporator inlet).
b. Plug suction line connection at P.O.A. valve outlet.
c. Disconnect oil bleed line at P.O.A. valve, using care
not to damage line.
d. Connect a cylinder of Refrigerant-12 regulated to
not exceed 125 psi to this oil bleed fitting to force any
retained oil from the evaporator out the evaporactor
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 "1" above contains any foreign
material such as chips, or there is evidence of moisture
in the system, replace the receiver-dehydrator assem-
bly and flush all component parts, or replace if
necessary. After flushing refrigeration system in this
manner, the full oil charge should be left in the new
service compressor (1 1 ozs.) installed in an overhauled
or repaired 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 old compressor on the car. Be sure
valves on gauge set are fully clockwise to close gauge
set to center fitting, that a J 5420 or J 6163 Schrader
adapter is between 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 persons and car surfaces from
oil or regrigerant.
3. Slowly depressurize refrigeration system.