oil CHEVROLET DYNASTY 1993 Service Manual

WHEELSÐTIRES
CONTENTS
page page
SPECIFICATIONS ........................ 8
TIRE SERVICE PROCEDURES .............. 1 WHEELS SERVICE PROCEDURES
........... 6
TIRE SERVICE PROCEDURES INDEX
page page
Cleaning of Tires .......................... 1
General Information ........................ 1
Pressure Gauges ......................... 2
Radial-Ply Tires ........................... 1
Repairing Leaks .......................... 3
Rotation ................................ 3 Spare TireÐCompact
...................... 1
Tire Inflation Pressures ..................... 2
Tire Noise or Vibration ..................... 3
Tire Wear Patterns ........................ 3
Tread Wear Indicators ...................... 3
GENERAL INFORMATION
Throughout this group, references may be made to a
particular vehicle by letter or number designation. A
chart showing the breakdown of these designations is
included in the Introduction Section. Tires are designed for the vehicle and provide the
best overall performance for normal operation. The
ride and handling characteristics match the vehicle's
requirements. With proper care they will give excellent
reliability traction, skid resistance and tread life. They
have load carrying capacity, when properly inflated, to
operate at loads up to the specified Maximum Vehicle
Capacity. Driving habits have more effect on tire life than any
other factor. Careful drivers will obtain, in most cases,
much greater mileage than severe or careless drivers. A
few of the driving habits which will shorten the life of
any tire are:
² Rapid acceleration and deceleration
² Severe application of brakes
² High-speed driving
² Taking turns at excessive speeds
² Striking curbs and other obstacles
Radial ply tires can be more susceptible to irregular
tread wear. It is very important to follow the tire
rotation interval shown in the section on Tire
Rotation to achieve a greater tread life potential.
RADIAL-PLY TIRES
Radial-ply tires improve handling, tread life, and
ride quality and decrease rolling resistance. Radial-ply tires must always be used in sets of four
and under no circumstances should they be used on
the front only. However, they may be mixed with temporary spare tires when necessary,
but reduced speeds are recommended. Radial-ply tires have the same load carrying capac-
ity as other types of tires of the same size. They also
use the same recommended inflation pressures.
SPARE TIREÐCOMPACT
The compact spare tire is designed for emergency
use only. The original tire should be repaired and re-
installed at the first opportunity. Refer to Owner's
Manual for complete details.
TIRE CHAINS
Tire snow chains may be used on certainmodels.
Refer to Owner's Manual for more information.
CLEANING OF TIRES
Remove protective coating on tires before delivery
of vehicle, otherwise it could cause deterioration of
tires. Remove protective coating by applying warm wa-
ter, letting it soak one minute, and then scrubbing
the coating away with a soft bristle brush. Steam cleaning may also be used for cleaning.
DO NOT use gasoline or wire brush for cleaning.
DO NOT use mineral oil or an oil-based solvent.
Ä WHEELSÐTIRES 22 - 1

ponents. Under extremes of suspension and steering
travel tire damage may occur.
WARNING: FAILURE TO EQUIP THE VEHICLE WITH
TIRES HAVING ADEQUATE SPEED RATING CAN
CAUSE SUDDEN TIRE FAILURE.
ROTATION
DIRECTIONAL TREAD PATTERN TIRES
Some vehicles are fitted with special high-perfor-
mance tires having a directional tread pattern de-
signed to improve traction on wet pavement. To obtain the full benefits of this design, the tires
must be installed so that they rotate in the correct
direction. This is indicated by arrows on the tire
sidewalls. When wheels and tires are being installed, extra
care is needed to ensure that this direction of rota-
tion is maintained. Refer to Owner's Manual for rotation schedule.
NONDIRECTIONAL TIRES
Tires on the front and rear axles of vehicles oper-
ate at different loads and perform different steering,
driving, and braking functions. For these reasons,
they wear at unequal rates, and tend to develop ir-
regular wear patterns. These effects can be reduced
by timely rotation of tires. Rotation will increase
tread life, help to maintain mud, snow, and wet trac-
tion levels, and contribute to a smooth, quiet ride. The suggested rotation method is the forward-cross
tire rotation method. This method takes advantage of
current tire industry practice which now allows cross
rotation of radial-ply tires. Refer to the owner's man-
ual (usually found in the glove box) for additional in-
formation. Other rotation methods may be used, but
may not have all the benefits of the recommended
method. Always check air pressure and wheel nut tightness
after rotation. Do NOT use oil or grease on studs
or nuts. Refer to Owner's Manual for rotation schedule.
TREAD WEAR INDICATORS
Tread wear indicators (Fig. 3) are molded into the
bottom of the tread grooves. When tread is 1.6 mm
(1/16 in.), the tread wear indicators will appear as a
13 mm (1/2 in.) band. Tire replacement is necessary when indicators ap-
pear in two or more grooves, or if localized balding
occurs.
REPAIRING LEAKS
For proper repairing, a radial tire must be removed
from the wheel. Repairs should only be made if the
defect or puncture is in the tread area otherwise the
tire should be replaced. Deflate tire completely before dismounting tire
from the wheel. Use lubrication such as a mild soap
solution when dismounting or mounting tire. Use
tools free of burrs or sharp edges which could dam-
age the tire or wheel rim. Before mounting tire on wheel, make sure all rust
scale is removed from the rim and repaint if neces-
sary. Install wheels on vehicle, progressively tightening
wheel nuts to 129 N Im (95 ft. lbs.) torque (See
Wheels).
TIRE NOISE OR VIBRATION
Radial-ply tires are sensitive to force impulses
caused by improper mounting, wheel irregularities,
or imbalance. To determine if the tires are causing the noise or
vibration, drive the vehicle over a smooth portion of
highway at different speeds and note the effect of ac-
celeration and deceleration on noise level. Differen-
tial and exhaust noise will change in intensity as
speed varies, while tire noise will usually remain
constant.
TIRE WEAR PATTERNS
Under inflation results in faster wear on shoulders
of tire. Over inflation causes faster wear at center of tread.
Excessive camber causes the tire to run at an angle
to the road. One side of tread is worn more than the
other. Excessive toe-in or toe-out causes wear on the
tread edges of the tire, from dragging of tire. There
is a feathered effect across the tread (Fig. 4).
Fig. 3 Tread Wear Indicators
Ä WHEELSÐTIRES 22 - 3

WHEELS SERVICE PROCEDURES INDEX
page page
General Information ........................ 6
Tire and Wheel Balance .................... 6
Tire and Wheel Run Out .................... 7 Wheel Installation
......................... 6
Wheel Replacement ....................... 6
GENERAL INFORMATION
Original equipment wheels are designed for proper
operation at all loads up to the maximum vehicle ca-
pacity. All models use steel or cast aluminum drop center
wheels. The safety rim wheel (Fig. 1) has raised sec-
tions between the rim flanges and the rim well A.
Initial inflation of the tires forces the bead over
these raised sections. In case of tire failure the raised
sections help hold the tire in position on the wheel
until the vehicle can be brought to a safe stop. Cast aluminum wheels require special balance
weights and alignment equipment.
WHEEL INSTALLATION
The wheel studs and nuts are designed for specific
applications and must be replaced with equivalent
parts. Do not use replacement parts of lessor quality
or a substitute design. All aluminum and some steel
wheels have wheel stud nuts which feature an en-
larged nose. This enlarged nose is necessary to en-
sure proper retention of the aluminum wheels. Before installing the wheel, be sure to remove any
build up of corrosion on the wheel mounting surfaces
with scraping and wire brushing. Installing wheels
without good metal-to-metal contact could cause later
loosening of wheel nuts. This could adversely affect
the safety and handling of your vehicle. To install the wheel, position it properly on the
mounting surface using the hub pilot as a guide. All wheel nuts should be lightly tightened before progres-
sively tightening them in sequence (Fig. 2). Tighten
wheel nuts to 129 N Im (95 ft. lbs.). Never use oil or
grease on studs or nuts.
WHEEL REPLACEMENT
Wheels must be replaced if they:
² have excessive run out
² are bent or dented
² leak air through welds
² have damaged bolt holes
Wheel repairs employing hammering, heating, or
welding are not allowed. Original equipment replacement wheels are avail-
able through your dealer. When obtaining wheels from
any other source, the replacement wheels should be
equivalent in load carrying capacity. The wheel dimen-
sions (diameter, width, offset, and mounting configura-
tion) must match original equipment wheels. Failure to
use equivalent replacement wheels may adversely af-
fect the safety and handling of your vehicle. Replace-
ment with used wheels is not recommended as
their service history may have included severe
treatment or very high mileage and they could
fail without warning.
TIRE AND WHEEL BALANCE
Balancing need is indicated by vibration of seats,
floor pan, or steering wheel when driving over 90 km/h
(55 mph) on a smooth road.
Fig. 1 Safety Rim
Fig. 2 Tightening Wheel Nuts (5-Stud)
22 - 6 WHEELSÐTIRES Ä

PAINT
INTRODUCTION
A paint code is provided on the body code plate
located in the engine compartment. Refer to the Intro-
duction section at the front of this manual for body code
plate description. The color names provided in the
Paint and Trim Code Description chart are the color
names used on most repair product containers. The
color names in the new vehicle ordering guides vary
depending on car line but use the same color code.
BASE COAT/CLEAR COAT FINISH
On most vehicles a two part paint application (base
coat/clear coat) is used. Color paint that is applied to
primer is called base coat. The clear coat protects the
base coat from ultra violet light and provides a durable
high gloss finish.
WET SANDING,BUFFING AND POLISHING
Minor acid etching, orange peel or smudging in clear
coat can be reduced with light wet sanding, hand
buffing and polishing. If the finish has been wet sanded
in the past, it can not be repeated. Wet sanding
operation should be performed by a trained automotive
painter.
CAUTION: Do not remove clear coat finish, if
equipped. Base coat paint must retain clear coat to
shine.
PAINTED SURFACE TOUCH-UP
When a painted metal surface has been scratched or
chipped, it should be touched-up as soon as possible to avoid corrosion. For best results, use Mopar
tScratch
Filler/Primer, Touch-Up Paints and Clear Top Coat.
Refer to Introduction group of this manual for Body
Code Plate information.
TOUCH-UP PROCEDURE
(1) Scrape loose paint and corrosion from inside
scratch or chip. (2) Clean affected area with Mopar tTar/Road Oil
Remover and allow to dry. (3) Fill the inside of the scratch or chip with a coat of
filler/primer. Do not overlap primer onto good surface
finish. The applicator brush should be wet enough to
puddle fill the defect without running. Do not stroke
brush applicator on body surface. Allow the filler/
primer to dry hard. (4) Cover the filler/primer with color touch-up paint.
Do not overlap touch-up color onto the original color
coat around the scratch or chip. Butt the new color to
the original color if possible. Do not stroke applicator
brush on body surface. Allow touch-up paint to dry
hard. (5) On vehicles without clear coat, the touch-up color
can be lightly (600 grit) wet sanded and polished with
rubbing compound. (6) On vehicles with clear coat, Apply clear top coat
to touch-up paint with the same technique as described
in step 4. Allow clear top coat to dry hard. If desired,
step 5 can be performed on clear top coat.
23 - 4 BODY Ä

AG-VEHICLE BODY COMPONENT SERVICE INDEX
page page
A-Pillar and Roof Rail Mouldings ............. 61
Body Side Applique ....................... 60
Body Side Mouldings ...................... 60
Closure Panel Sight Shield ................. 52
Cowl Cover ............................. 54
Door Glass ............................. 58
Door Glass Opening Moulding ............... 59
Door Latch ............................. 57
Door Opening Scuff Plates ................. 61
Door Opening Weatherstrips ................ 60
Door Trim Panel ......................... 56
Floor Carpet ............................ 64
Front Center Console ..................... 64
Front Door and Hinge ..................... 56
Front Door Silencer and Water Shield ......... 56
Front End Splash Shields .................. 54
Front Fender ............................ 55
Front Seat Belts ......................... 61
Front Seats ............................. 63
Fuel Fill Door ........................... 68
Glass Run Weatherstrip ................... 58
Head Lining ............................. 65
Hood and Hinges ........................ 52
Hood Applique .......................... 54
Hood Latch and Release Cable .............. 53
Hood Latch Safety Catch .................. 54
Inside Latch Release Handle ................ 59 Lift Gate
............................... 67
Lift Gate and Fuel Fill Door Release Cables .... 69
Lift Gate Latch and Striker ................. 68
Lift Gate Lock Cylinder .................... 68
Lift Gate Prop Cylinder .................... 67
Lift Gate Spoiler ......................... 67
Lift Gate Trim ........................... 61
Lower Quarter Trim Panel .................. 61
Lower Tail Panel Trim Cover ................ 61
Manual Window Lift Plate and Guide .......... 58
Manual Window Regulator .................. 57
Manual Window Regulator .................. 58
Outside Door Latch Release Handle .......... 58
Overhead Console ........................ 65
Power Door Lock Actuator .................. 59
Power Window Regulator .................. 57
Quarter Glass Module ..................... 66
Quarter Panel Spoiler ..................... 67
Rear Seat Belts .......................... 62
Rear Seats ............................. 63
Rear Window Glass ...................... 65
Roof Seam Molding ....................... 66
Side View Mirror ......................... 59
Sunroof Lift Control ....................... 65
Tail Lamp Closure Panel ................... 69
Upper Quarter Trim Panel .................. 61
CLOSURE PANEL SIGHT SHIELD
REMOVAL (FIG. 1)
(1) Raise hood to open position.
(2) Loosen twist fasteners holding headlamp covers
to fascia. (3) Disengage hook and loop fasteners holding
sight shield to radiator closure panel. (4) Remove push-in fasteners holding sight shield
to bumper fascia. (5) Separate sight shield from vehicle.
INSTALLATION
Reverse the preceding operation.
HOOD AND HINGES
HOOD REMOVAL (FIG. 2)
(1) Raise hood to full up position.
(2) Lift front edge of cowl cover on the right side of
the windshield washer bottle and disconnect the un-
der hood lamp wire connector. (3) Mark all bolt and hinge attachment locations
with a grease pencil or other suitable device to pro-
vide reference marks for installation. When install-
ing hood, align all marks and secure bolts. The hood should be aligned to 4 mm (0.160 in.) gap to the front
fenders and flush across the top surfaces along fend-
ers. (4) Remove the top hood to hinge attaching bolts
and loosen the bottom bolts until they can be re-
moved by hand. (5) With assistance of a helper at the opposite side
of the vehicle to support the hood, remove the bottom
hood to hinge attaching bolts. Separate the hood
from the vehicle.
Fig. 1 Closure Panel Sight Shield
23 - 52 AG-BODY Ä

(4) Separate molding from roof panel.
INSTALLATION
Reverse the preceding operation.
QUARTER PANEL SPOILER
REMOVAL (FIG. 38)
(1) Remove access cover from lift gate opening end
of quarter panel spoiler. (2) Remove bolt holding spoiler to tail lamp closure
panel. (3) Remove quarter trim panel.
(4) Remove nuts holding spoiler to quarter panel
from behind quarter panel above rear wheelhouse
(Fig. 38). (5) Separate spoiler from vehicle.
INSTALLATION
Reverse the preceding operation.
LIFT GATE SPOILER
REMOVAL (FIG. 39)
(1) Raise lift gate to the up position.
(2) Remove nuts holding spoiler to outboard pinch
flanges of lift gate. (3) Separate spoiler from lift gate.
INSTALLATION
Reverse the preceding operation.
LIFT GATE PROP CYLINDER
REMOVAL (FIG. 40)
(1) raise lift gate to the full open position.
(2) Support lift gate on a suitable lifting device.
(3) Remove bolt holding bottom of lift gate prop
cylinder to c-pillar. (4) Remove bolt holding top of lift gate prop cylin-
der to lift gate. (5) Separate prop cylinder from vehicle.
INSTALLATION
Reverse the preceding operation.
LIFT GATE
REMOVAL (FIG. 41)
(1) Raise lift gate to the full open position.
(2) Remove rear roof header molding.
Fig. 36 Quarter Glass Module
Fig. 37 Roof Seam Molding
Fig. 38 Quarter Panel Spoiler
Fig. 39 Lift Gate Spoiler
Ä AG-BODY 23 - 67

(5) Remove bolt holding quarter panel spoiler to
tail lamp closure panel, if equipped. (6) Remove tail lamps and license plate lamps, re-
fer to Group 8L, Lamps for proper procedures. (7) Remove nuts holding tail lamp closure panel to
tail panel. (8) Remove nuts holding tail lamp closure panel to
quarter panel ends. (9) Separate tail lamp closure panel from vehicle.
INSTALLATION
Reverse the preceding operation.
Fig. 46 Tail Lamp Closure Panel
23 - 70 AG-BODY Ä

TRUNK LID TORSION BAR
REMOVAL
(1) Raise and support trunk lid in the full up posi-
tion. (2) Remove trunk lining as necessary to gain ac-
cess to torsion bars. (3) Disengage adjusting end of torsion bar from the
slot in the tension adjustment bracket. (4) Pivot torsion bar out of lift arm swivel.
(5) Disconnect torsion bar from hinge.
INSTALLATION
Reverse the preceding operation.
TRUNK LID LATCH
REMOVAL
(1) Raise trunk lid to the full up position.
(2) Remove push-in fasteners holding lining to
trunk lid as necessary. (3) Disconnect remote release cable from latch.
(4) Remove bolts holding latch to trunk lid and
separate latch from vehicle.
INSTALLATION
Insert trunk lock chill into latch release driver and
reverse the preceding operation.
TRUNK LID LOCK
REMOVAL
(1) Remove trunk lid tail light assembly. Refer to
Group 8L, Lamps for proper procedures. (2) Remove trunk latch.
(3) Remove nuts holding lock cylinder and chill to
trunk lid and separate the lock from the vehicle.
INSTALLATION
Reverse the preceding operation.
TRUNK OPENING WEATHERSTRIP
REMOVAL (FIG. 25)
(1) Raise trunk lid to the full up position.
(2) Pull the weatherstrip from the pinch flange
around the trunk opening.
INSTALLATION
A new trunk lid opening weatherstrip should be
heated to approximately 38É C (100É F) before instal-
lation. The weatherstrip butt splice should be located
at the center rear of trunk opening. Reverse the re-
moval operation. After weatherstrip has been in-
stalled, close trunk lid and allow weatherstrip to
cool. The weatherstrip will form to the trunk lid con-
tour as it cools.
TRUNK LID LUGGAGE RACK
REMOVAL (FIG. 26)
(1) Remove screws holding spoiler to trunk lid.
(2) Pry rub strip inserts from skid strips.
(3) Remove screws holding skid strips to trunk lid.
INSTALLATION
Reverse the preceding operation
TRUNK LID AND FUEL FILL DOOR RELEASE
CABLES
REMOVAL (FIG. 27)
(1) Remove interior trim as necessary to gain ac-
cess to release cables. (2) Remove left front door scuff plate.
(3) Remove screw holding trim cover to release ca-
ble handle and separate cover from handle. (4) Remove screw holding release handle to door
sill. (5) Pry open retainer tab holding cable core end in
handle pivot. Pry cable case end from handle. (6) Remove trunk lining as necessary to gain ac-
cess to the release cables.
Fig. 24 Trunk LidÐTypical
Fig. 25 Trunk Opening WeatherstripÐTypical
Ä AJ-BODY 23 - 83

SAFETY PRECAUTIONS AND WARNINGS
WARNING: WEAR EYE PROTECTION WHEN SER-
VICING THE AIR CONDITIONING REFRIGERANT
SYSTEM. SERIOUS EYE INJURY CAN RESULT
FROM EYE CONTACT WITH REFRIGERANT. IF EYE
CONTACT IS MADE, SEEK MEDICAL ATTENTION
IMMEDIATELY. DO NOT EXPOSE REFRIGERANT TO OPEN
FLAME. POISONOUS GAS IS CREATED WHEN RE-
FRIGERANT IS BURNED. AN ELECTRONIC TYPE
LEAK DETECTOR IS RECOMMENDED. LARGE AMOUNTS OF REFRIGERANT RELEASED
IN A CLOSED WORK AREA WILL DISPLACE THE
OXYGEN AND CAUSE SUFFOCATION. THE EVAPORATION RATE OF (R-12) REFRIGER-
ANT AT AVERAGE TEMPERATURE AND ALTITUDE
IS EXTREMELY HIGH. AS A RESULT, ANYTHING
THAT COMES IN CONTACT WITH THE REFRIGER-
ANT WILL FREEZE. ALWAYS PROTECT SKIN OR
DELICATE OBJECTS FROM DIRECT CONTACT
WITH REFRIGERANT.
CAUTION: Liquid refrigerant is corrosive to metal
surfaces. Follow the operating instructions supplied
with equipment being used.
COOLING SYSTEM PRECAUTIONS
WARNING: ANTIFREEZE IS AN ETHYLENE GLYCOL
BASE COOLANT AND IS HARMFUL IF SWAL-
LOWED OR INHALED. IF SWALLOWED, DRINK
TWO GLASSES OF WATER AND INDUCE VOMIT-
ING. IF INHALED, MOVE TO FRESH AIR AREA.
SEEK MEDICAL ATTENTION IMMEDIATELY. DO NOT STORE IN OPEN OR UNMARKED CON-
TAINERS. WASH SKIN AND CLOTHING THOROUGHLY AF-
TER COMING IN CONTACT WITH ETHYLENE GLY-
COL. KEEP OUT OF REACH OF CHILDREN AND PETS.
DO NOT OPEN A COOLING SYSTEM WHEN THE
ENGINE IS AT RUNNING TEMPERATURE. PER-
SONAL INJURY CAN RESULT.
The engine cooling system is designed to develop
internal pressure of 97 to 123 kPa (14 to 18 psi). Al-
low the vehicle 15 minutes (or until a safe tempera-
ture and pressure are attained) before opening the
cooling system. Refer to Group 7, Cooling System.
HANDLING TUBING AND FITTINGS
Kinks in the refrigerant tubing or sharp bends in
the refrigerant hose lines will greatly reduce the ca-
pacity of the entire system. High pressures are pro-
duced in the system when it is operating. Extreme
care must be exercised to make sure that all connec-
tions are pressure tight. Dirt and moisture can enter
the system when it is opened for repair or replace-
ment of lines or components. The refrigerant oil will
absorb moisture readily out of the air. This moisture
will convert into acids within a closed system. The following precautions must be observed:
The system must be completely empty before open-
ing any fitting or connection in the refrigeration sys-
tem. Open fittings with caution even after the
system has been emptied. If any pressure is noticed
as a fitting is loosened, allow trapped pressure to
bleed off very slowly. A good rule for the flexible hose lines is to keep the
radius of all bends at least 10 times the diameter of
the hose. Sharper bends will reduce the flow of re-
frigerant. The flexible hose lines should be routed so
they are at least 3 inches (80 mm) from the exhaust
manifold. Inspect all flexible hose lines to make sure
they are in good condition and properly routed. Unified plumbing connections with aluminum gas-
kets cannot be serviced with O-rings. These gaskets
are not reusable and do not require lubrication be-
fore installing. The use of correct wrenches when making connec-
tions is very important. Improper wrenches or im-
proper use of wrenches can damage the fittings. The A/C system will remain chemical stabile as
long as pure-moisture-free R-12 and refrigerant oil is
used. Abnormal amounts of dirt, moisture or air can
upset the chemical stability. This condition could
cause operational troubles or even serious damage if
present in more than very small quantities. When it is necessary to open the refrigeration sys-
tem, have everything needed to service the system
ready. The system should not be left open any longer
than necessary. Cap or plug all lines and fittings as
soon as they are opened to prevent the entrance or
dirt and moisture. All lines and components in parts
stock should be capped or sealed until they are ready
to be used. All tools, including the refrigerant dispensing man-
ifold, the manifold gauge set, and test hoses should
be kept clean and dry.
Fig. 6 Heater only or HeaterÐA/C Controls
Ä HEATING AND AIR CONDITIONING 24 - 3

REFRIGERANT SERVICE PROCEDURES INDEX
page page
Adding Partial Refrigerant Charge ............ 10
Charging Refrigerant SystemÐEmpty System . . . 11
Discharging Refrigerant System .............. 11
Evacuating Refrigerant System .............. 11
Manifold Gauge Set Connections ............. 9 Oil Level
............................... 12
R-12 Refrigerant Equipment ................. 8
Refrigerant Recycling ...................... 9
Sight Glass Refrigerant Level Inspection ........ 8
Testing for Refrigerant Leaks ............... 10
SIGHT GLASS REFRIGERANT LEVEL INSPECTION
The filter-drier is equipped with a sight glass (Fig.
1) that is used as a refrigerant level indicator only.
This sight glass is not to be used for A/C perfor-
mance testing. To check the refrigerant level re-
move the vehicle jack. Then clean the sight glass,
start and warm up engine, and hold rpm slightly
above idle (1100 rpm). Place the air conditioning con-
trol on A/C, RECIRC and high blower. The work
area should be at least 21ÉC (70ÉF). If a Fixed Dis-
placement type compressor does not engage, the re-
frigerant level is probably too low for the Low
Pressure Cut-Off switch to detect. Or, with a Vari-
able Displacement compressor, for the Differential
Pressure Cut-off to detect. If compressor clutch does
not engage, test the refrigerant system for leaks. If
compressor clutch engages, allow approximately one
minute for refrigerant to stabilize. View refrigerant
through sight glass. The suction line should be cold
to the touch and the sight glass should be clear.
If foam or bubbles are visible in sight glass, the re- frigerant level is probably low. Occasional foam or
bubbles are normal when the work area temperature
is above 43ÉC (110ÉF) or below 21ÉC (70ÉF). If suction
line is cold and occasional bubbles are visible in the
sight glass, block the condenser air flow. This will in-
crease the compressor discharge pressure. Do not al-
low engine to over heat. Bubbles should dissipate.
If not, the refrigerant level is low.
CAUTION: Do not allow engine to over heat while
blocking the condenser air flow.
WARNING: R-12 REFRIGERANT IS DETRIMENTAL
TO THE ENVIRONMENT WHEN RELEASED TO THE
ATMOSPHERE. DO NOT ADD R-12 REFRIGERANT
TO A SYSTEM THAT HAS A KNOWN LEAK.
The refrigerant system will not be low on (R-12)
unless there is a leak. Find and repair the leak be-
fore charging.
R-12 REFRIGERANT EQUIPMENT
WARNING: EYE PROTECTION MUST BE USED
WHEN SERVICING AN AIR CONDITIONING REFRIG-
ERANT SYSTEM. TURN OFF (ROTATE CLOCKWISE)
ALL VALVES ON THE EQUIPMENT BEING USED
BEFORE PROCEEDING WITH THIS OPERATION.
PERSONNEL INJURY CAN RESULT.
When servicing an air conditioning system, an A/C
charging station is recommended (Fig. 2). An (R-12)
refrigerant recovery/recycling device (Fig. 3) should
also be used. This device should meet SAE standards.
Contact an automotive service equipment supplier
for refrigerant recycling/recovering equipment. Refer
to the operating instructions provided with the
equipment for proper operation. A manifold gauge set (Fig. 4) must also be used in
conjunction with the charging and/or recovery/recy-
cling device. The service hoses on the gauge set be-
ing used should have manual (turn wheel) or
automatic back flow valves at the service port con-
nector ends. This will prevent refrigerant from being
release into the atmosphere.
Fig. 1 Filter Drier and Sight Glass
24 - 8 HEATING AND AIR CONDITIONING Ä