Pontiac Fiero 1988 Service Manual page 64

AIR CONDITIONING 1B-19
involves opening the refrigeration system. Always
work in a well ventilated area and avoid breathing any
refrigerant fumes. If liquid refrigerant comes into con-
tact with the eyes, injury may result.
• Before removing and replacing any of the air
conditioning refrigeration lines or components,
the system must be completely discharged of
Refrigerant-12.
• Always use service valve and pressure gage sets
during evacuation and charging procedures.
• Always discharge system at low-side service fit-
ting and perform the entire evacuate and charg-
ing procedure through the low-side service
fitting.
• Do not connect high-pressure line or any line to
the high-side service fitting during discharging
and charging procedures.
C A U T I O N : N e v e r r e m o v e a g a g e l i n e
f r o m its a d a p t e r w h e n line i s c o n n e c t e d
to A/C s y s t e m . A l w a y s r e m o v e t h e line
a d a p t e r f r o m t h e s e r v i c e fitting t o d i s -
c o n n e c t a line. D o n o t r e m o v e c h a r g i n g
h o s e at g a g e s e t w h i l e a t t a c h e d t o s e r -
v i c e l o w - s i d e fitting. T h i s w i l l r e s u l t in
c o m p l e t e d i s c h a r g e of s y s t e m d u e t o
t h e d e p r e s s e d S c h r a d e r v a l v e in s e r v i c e
l o w - s i d e fitting a n d m a y c a u s e p e r s o n a l
injury d u e t o e s c a p i n g R e f r i g e r a n t - 1 2 .
" Discharging t h e A/C S y s t e m
In replacing any of the air conditioning refriger-
ation components, the system must be completely dis-
charged of Refrigerant-12.
A L W A Y S D I S C H A R G E S Y S T E M AT
LOW-SIDE SERVICE FITTING
1. With ignition turned "OFF," remove protective
cap from LOW-SIDE service fitting (on most
models) on Accumulator and connect charging
station J-23500-01 or equivalent gage set. If
charging station J-23500-01 or equivalent is not
being used, discharge system by slowly con-
necting a gage hose to low-side service fitting
on accumulator and discharging into oil bottle
(Figure 18). As hose is slowly tightened down
onto Schrader valve, Refrigerant-12 will begin
to discharge from the system into the container.
If no discharge occurs, check for missing or
defective Schrader depressor in hose fitting.
2. With the low-side of system fully discharged,
check high-side system fitting (on liquid line or
muffler) for remaining pressure.
3. If pressure is found, attempt to discharge high-
side using same procedure as used for low-side.
(This condition indicates a restriction on the
high-side and the cause must be diagnosed and
corrected before evacuating and charging the
system.)
1-USING J 5420 4 — R E F R I G E R A N T OIL
ADAPTER BOTTLE UNCAPPED
TO ALLOW GAS
TO ESCAPE
2— GAGE HOSE
5 - A C C U M U L A T 0 R
3 - OIL
520009-1 B
Figure 18 Discharging the A/C System Without
Charging Station
4. When the system is completely discharged (no
vapor escaping with hose fully tightened down),
measure, record amount, and discard the col-
lected refrigerant oil. If the measured quantity is
15ml (1/2 fl. oz.) or more, this amount of new
525 viscosity refrigerant oil must be added to
system, plus any quantity in removed parts
before system evacuation and charging with
Refrigerant-12 (see REFRIGERANT OIL DIS-
TRIBUTION for specific quantity of oil nor-
mally retained in removed parts).
Adding Oil to the Air Conditioning
Refrigerant System
ADDING OIL TO THE A/C SYSTEM should
take place AFTER discharge and BEFORE evacua-
tion procedures by removing the refrigeration suction
hose at the accumulator outlet pipe connection, pour-
ing the correct quantity of new refrigerant oil into the
hose or pipe and then properly reconnecting hose to
pipe (see REFRIGERANT OIL DISTRIBUTION for
specific quantity instructions).
Refrigerant Oil Distribution
© V-5 COMPRESSOR SYSTEM — Requires
240ml (8 fluid ounces) of 525 viscosity refriger-
ant oil.