Checking Compressor Oil Level And Adding Oil; Replacing Refrigeration System; Components Other Than Compressor - Pontiac Grand Prix Service Manual

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1 % 9 PONTIAC SERVICE MANUAL
refrigerant drum and pail of water. Then slowly open
valve on gauge set (or refrigerant drum) and add one
more pound of refrigerant. Note total amount of
refrigerant added.
REFRIGERANT-12 DISPOSABLE CAN METHOD
(15 OZ. PER CAN).
a. Make sure the outlet valve on the J 6271 Fitz-All
valve is fully clockwise and attach the J 6271 to a "one
pound" can of refrigerant as follows: back off the
valve from the top of the retainer, slip the valve onto
the can and turn the valve into the retainer until tight.
DO NOT accidentally open outlet valve during this
operation as turning the valve into the retainer
punctures the top of the can to make it ready for
charging.
b. Connect center flexible line of gauge set to the
fitting on the valve.
c. Start engine, move temperature control knob to full
cold position and blower control for high speeds A/C
mode. Operate engine for ten minutes at 2000 rpm to
stabilize system.
d. With compressor operating, slowly open valve on
refrigerant can and allow refrigerant to flow into
system (through manifold gauge set) until liquid
indicator clears up and immediately shut off valve at
gauge set and on refrigerant can. Check weight of can
and valve assembly and record.
e.
Add an additional one pound of refrigerant by
adding refrigerant from the can just weighed until can
is empty. Attach another can and add refrigerant until
can and valve assembly weigh the same as recorded.
6. Close valves at refrigerant drum or can.
7. Test for leaks and make operational check of system
as outlined unde OPERATIONAL TEST.
CHECKING COMPRESSOR OIL LEVEL AND
ADDING OIL
The refrigeration system with the six-cylinder axial
compressor r e q ~ e s 11 fluid 02s. of 525 viscosity oil.
After the system has been operated, oil circulates
throughout the system with the refrigerant. Hence,
while the system is running, oil is leaving the
compressor with the high pressure gas and is returning
to the compressor with the suction gas.
To enhance return of oil to the compressor, under
partially depleted refrigerant charge conditions on the
custom air conditioning system, an oil bleed line from
the bottom of the evaporator to ,the suction line at the
P.O.A. valve has been provided. The core in the bleed
line fitting at the P.O.A. valve has a special low force
spring in it which allows the core to open a 5 to 12 psi
pressure difference. It is important that this core not be
replaced with a standard tire core.
NOTE: The oil level in the compressor should not be
checked as a matter of course, such as is done in the car
engine crankcase.
In general, the compressor oil level should be ques-
tioned only in cases where there is evidence of a major
loss of system oil such as:
a. Broken hose or severe hose fitting leak.
b. Oil sprayed in large amounts under the hood due to
a badly leaking compressor seal(s).
c. Collision damage to refrigeration system compo-
nents.
REPLACING REFRIGERATION SYSTEM
COMPONENTS OTHER THAN COMPRESSOR
If there are no signs of excessive oil leakage, add the
following amount of oil depending on compbnent
replaced:
1. Evaporator
-
3 fluid ozs.
2. Condenser
-
1 fluid oz.
3. Receiver
-
1 fluid oz.
4. No oil for P.O.A., expansion valves or hoses.
When refrigerant system components other than the
compressor are replaced and there are signs of
abundant oil leakage, the compressor must also be
removed and oil drained from the compressor. The
amount of oil to put back into the ampressor is found
as follows: DO NOT add any more oil than is
necessary, or maximum cooling will be reduced.
1. Remove the compressor and place in a horizontal
position with the compressor drain plug downward,
drain compressor in an empty graduated bottle,
measure the amount of oil and discard this oil.
2. If the quantity of oil measured is more than 4 fluid
ozs., replace into the compressor the same amount of
clean oil as the oil drained, plus the following amount
for the refrigeration system component being changed.
a. Evaporator-3 fluid ozs.
b. Conderiser-1 fluid oz.
c. Receiver-dehydrator assembly-1 fluid oz.
Neglect any fluid oil coating loss in case of line
change.
3. If the oil quantity drained from the compressor is