Filter Installation; Expansion Tube (Orifice) Service - Pontiac Fiero 1988 Service Manual

1B-22 AIR CONDITIONING
5. If vacuum does not hold for five (5) minutes,
charge system with 420ml (1/2 pound) Refriger-
ant-12 and leak check. Discharge system again
and repair leak as necessary. Repeat evacuation
procedure.
To Begin Charging of t h e A/C System
1. Start engine and set A/C mode control button on
"OFF."
2. With the Refrigerant-12 drum or 420ml (14
ounce) can(s) inverted, open R-12 source
valve(s) and allow 480ml (1 pound) or one
420ml (14 oz.) can of liquid R-12 to flow into
system through low-side service fitting.
3. As soon as 480ml (1 lb.) or one 420ml (14 oz.)
can of R-12 has been added to system, immedi-
ately engage the compressor by setting the A/C
control button to NORM and blower speed on
HI, to draw in the remainder of the R-12 charge.
See specifications for total R-12 charge.
The charging operation can be sped up by using
a large volume fan to pass air over the con-
denser. If condenser temperature is maintained
below charging cylinder temperature, Refriger-
ant-12 will enter the system more rapidly.
4. Turn off R-12 source valve and run engine for
30 seconds to clear lines and gages.
5. With the engine running, remove the charging
low-side hose adapter from the accumulator ser-
vice fitting. Unscrew rapidly to avoid excess R-
12 escape from system.
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 I T S A D A P T E R W H E N L I N E
I S C O N N E C T E D
T O A / C
S Y S T E M .
A L W A Y S R E M O V E T H E L I N E A D A P T E R
F R O M T H E S E R V I C E F I T T I N G TO
D I S -
C O N N E C T A
L I N E . D O N O T R E M O V E
C H A R G I N G H O S E A T G A G E S E T W H I L E
A T T A C H E D TO
A C C U M U L A T O R . T H I S
W I L L R E S U L T I N 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 F I T T I N G , A N D M A Y
C A U S E P E R S O N A L I N J U R Y 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 .
6. Replace protective cap on accumulator fitting.
7. Turn engine off.
8. Leak check system with electronic leak detector
J-29547 or equivalent (see Diagnosis).
9. Start engine.
10. With system fully charged and leak-checked,
continue to operate system performance.
IN-LINE AIR CONDITIONING FILTER
INSTALLATION
An in-line air conditioning filter is available for
servicing vehicles which have experienced air condi-
tioning system contamination and can help absorb
moisture entering the system at higher mileages.
The in-line filter installation offers the customer
a less expensive alternative to system flushing and/or
replacement of the receiver dehydrator (accumulator)
assembly.
Aluminum Line Installation
(Installation instructions are included in the kit.)
1. Discharge air conditioning system per recom-
mended procedure.
2. If possible, select an installation location adja-
cent to area (fender well, etc.) that will allow
use of optional bracket.
3. Remove a sufficient amount of the line. Remove
burrs and loose particles from cut ends.
4. Insert pipe end into can fitting until pipe bot-
toms in the fitting body (Figure 21). If the fitting
requires assembly, the tapered end of the ferrule
goes into the fitting body.
5. Tighten fitting nut to "finger tight." Then with
open-end wrench, torque fitting nut while hold-
ing the can with a second open-end wrench.
(Figure 21)
6. Repeat assembly procedure for opposite end of
can.
7. Evacuate/recharge system per recommended
procedure (see Service Manual). If system has
been severely contaminated, examine the orifice
tube to determine if replacement will be
necessary.
Figure 21 Aluminum Line Filter Installation
EXPANSION TUBE (ORIFICE) SERVICE
Remove or Disconnect
1. Discharge system.
2. Loosen fitting at liquid line to evaporator inlet
pipe and remove tube carefully with needle
nosed pliers or Tool J-26549-C or equivalent.