Pontiac Fiero 1988 Service Manual page 65

1B-20 AIR CONDITIONING
Total
Residual Add
System Capacity
Quantity Quantity
V-5 -- 240ml (8 fl. oz.) = 45ml (1.5 fl. oz.)
+ 195ml (6.5 fl. oz.)
HR6 - 240ml (8 fl. oz.) = 45ml (1.5 fl. oz.) + 195ml (6.5 fl. oz.)
J 1 0 2 5 1 - 1 B - P
Figure 19 Refrigerant Oil Quanitities
• HR-6 COMPRESSOR SYSTEM — Requires
240ml (8 fluid ounces) of 525 viscosity refriger-
ant oil.
• R-4 COMPRESSOR SYSTEM — Requires
180ml (6 fluid ounces) of 525 viscosity refriger-
ant oil.
• New 525 viscosity refrigerant oil must be added
to the system when components are replaced, as
follows:
a All Compressors
• If less than 1 oz. is drained - add 2 oz.
• If more than 1 oz. is drained - add same
amount.
b. Accumulator Dehydrator
• Add 3.5 oz. to new accumulator.
c. Evaporator
• Add 3 oz. oil.
d. Condenser
• Add 1 oz. oil.
• Refrigerant oil loss due to a large leak
a. If the refrigerant charge is abruptly lost
due to a large refrigerant leak, approxi-
mately 3 oz. of refrigerant oil will be car-
ried out of the system suspended in the
refrigerant. Any failure that causes an
abrupt refrigerant discharge will experi-
ence this oil loss. Failures that allow the
refrigerant to seep or bleed off over time
do not experience this oil loss.
b. Upon replacement of a component which
caused a large refrigerant leak, add 3 oz.
of new 525 viscosity refrigerant oil plus
the required amount of oil for the particu-
lar component (as outlined above).
c. Add the oil directly to the replaced com-
ponent if possible. If the oil cannot easily
be added to the replaced part, add the oil
to the accumulator.
Evacuating and Charging the A/C System
If the system has been opened for any repair, or
the Refrigerant-12 charge lost, the system must be
evacuated prior to charging.
Evacuation and charging is a combined proce-
dure, and all gage lines must be purged with R-12
prior to charging.
There are three evacuate and charge procedures.
1. J 23500-01 Charging Station Method
2. Disposable Can Method
3. Drum Method
NOTICE:
Under no circumstances should alco-
hol be used in the system in an attempt to remove
moisture. Damage to the system components
could occur.
Gage Calibration
Prior to evacuation, check the low-pressure
gage for proper calibration and determine if vacuum
system is operating properly.
With the gage disconnected from the refrigera-
tion system, be sure that the pointer indicates to the
center of "0". Lightly tap gage a few times to be sure
pointer is not sticking. If necessary, calibrate as
follows:
1. Remove cover from gage.
2. Holding gage pointer adjusting screw firmly
with one hand, carefully force pointer in the
proper direction to position pointer at the "0"
position. Tap gage a few times to be sure pointer
is not sticking. Replace gage cover.
Vacuum System Check
Before connecting vacuum pump to the A/C
system, run pump connected to the low-pressure gage
to determine the vacuum pump capability. If the vac-
uum system is unable to reach 711.2-736.6mm (28"-
29") or more vacuum, the system should be checked
for leaks. If no leaks are found, the vacuum pump
may require repair.