Pontiac Fiero 1988 Service Manual page 66

AIR CONDITIONING 1B-21
J-235S0.il OR EQUIVALENT CHARGING 1.
STATION METHOD
Follow charging instructions provided with the
J-23500-01 Charging Station or equivalent in use with
the following exceptions:
1. Do not connect the high-pressure line to the air
conditioning system. 2
2. Keep the high-pressure valve on the charging
station closed at all times.
3. Perform the entire evacuate and charge proce-
dure through the accumulator low-side pressure
service fitting.
4. Following these procedures will prevent acci-
dental high-side vehicle system pressure being
subjected to the charging station in the event an
error is made in valve sequence during compres-
sor operation to pull in the Refrigerant-12
charge.
DISPOSABLE CAN OR REFRIGERANT
DRUM METHOD
If the Refrigerant-12 drum is used, place it on a
scale and note the total weight before charging. Watch 3.
the scale during charging to determine the amount of
R-12 used.
If disposable 420ml (14 ounce) R-12 cans are 4.
used, close the tapping valve and then attach can(s)
following instructions included with the tapping valve
or tapping manifold adapter.
Connect manifold gage set J-23575-01 as fol-
lows. Also see Figure 20.
a. Low-pressure gage to accumulator fitting.
b. Gage set center hose to Refrigerant-12
source.
c. High-pressure gage to vacuum pump.
To begin evacuation of the A/C System with
manifold gage set and vacuum pump as illus-
trated in Figure 20, slowly open high- and low-
side gage valves and begin vacuum pump opera-
tion. Pump the system until the low-side gage
reaches 711.2-736.6mm
(28"-29")
vacuum.
Note that in all evacuation procedures, the spec-
ification of 711.2-736.6mm (28"-29") vacuum is
used. This specification can only be reached at
or near sea level. For each 304.8m (1,000 feet)
above sea level, specification should be lowered
by one inch vacuum. At 1524m (5,000 feet)
elevation, only 584.2-609.6mm
(23"-24")
of
vacuum is required.
If prescribed vacuum cannot be reached, close
vacuum control valve, shut off pump and look
for a leak at connections or pump.
When gage reaches prescribed vacuum, the sys-
tem is fully evacuated. Close the high-side gage
set valve and turn off the vacuum pump.
Watch low-side gage to be sure vacuum holds
for five (5) minutes. If vacuum is held, discon-
nect vacuum hose at gage set and then proceed
to charging.
USING J 5420
ADAPTER
OPEN DURING
EVACUATION
AND CHARGING
THIS HI-PRESS. VALVE IS CLOSED & LINE DISCONNECTED
DURING DISCHARGING & CHARGING
LOW-SIDE
MULTI-CAN DISPENSING uNI T
USING J 6271-01 SINGLE CAN
OR
J 6272-02 MULTI CAN
OPENER-VALVE
ACCUMULATOR
J 23575-01
MANIFOLD
GAUGE SET
14 OZ. CANS
ii
II
'/ THIS HIGH PRESSURE VALVE
'/ IS OPEN & VAC. PUMP LINE
M CONNECTED ONLY DURING
fV EVACUATION
VACUUM PUMP
DECREASE OF WEIGHT
ON SCALE INDICATES
CHARGE ADDED
30 LB. DRUM HAS
OWN OPENER-VALVE
WARNING: MAKE SURE OUTLET VALVE
ON OPENER IS CLOSED (CLOCKWISE)
BEFORE INSTALLING OPENER TO
R-12 CONTAINER. _
OPEN AND INVERTED-
^ D U R I N G CHARGING
CLOSED DURING
EVACUATION
USING J 23390
OPENER-VALVE FOR 12 LB. CAN
8 2 0 0 1 0 - 1 B
Figure 20 Charging the System With Disposable Can or Drum