1993 CHEVROLET DYNASTY oil

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

backed off, immediately point the end of hose toward
floor, as possibly trapped refrigerant in the hose will
be released.(e) Install service port cap.
DISCHARGE (HIGH PRESSURE) GAUGE CONNECTION (1) Remove the service port cap from the 1/4 in.
service port. (2) Check all valves on the equipment being used to
verify they are closed. (3) Inspect the hose gasket in the service port con-
nector at the end of the (RED) hose. If the gasket is
flawed, replace it. (4) Use a suitable (3/8 in. male to 1/4 in. female)
adapter (Fig. 5), threaded securely into the end of the
(RED) hose connector.
(5) Thread the 1/4 in. hose adapter connector onto
the service port. Quickly secure adapter connector to
service port to avoid loosing refrigerant. To disconnect the discharge gauge (RED) hose:(a) Wrap the end of hose with a shop towel.
(b) Loosen the hose connector.
(c) Push and hold the end of hose toward the
service port to keep the gasket in contact with service
port. (d) Quickly rotate the connector counterclockwise.
When the hose connector is completely backed off,
immediately point the end of hose toward floor, as
possibly trapped refrigerant in the hose will be
released. (e) Install service port cap.
EVACUATION/RECOVERY/RECYCLING/CHARGING LINE CON-
NECTION
The center manifold (YELLOW) or (WHITE) hose is
used to recycle, recover, evacuate, and charge the
refrigerant system. When the discharge or suction
valves on the manifold gauge set are opened, the
refrigerant in the system will escape through this hose. This hose should be attached to a R-12
Recovery/Recycling device. Refer to the
Recovery/Recycling devices operators manual
for procedures. For disconnection of this hose, refer to Disconnect-
ing the Discharge Gauge (RED) hose in the preced-
ing paragraphs.
TESTING FOR REFRIGERANT LEAKS
If the A/C system is not cooling properly, deter-
mine if the refrigerant system is fully charged with
R-12. Follow the procedures in the Performance Test
Procedures section of this Group. If the refrigerant
system is empty or low in refrigerant charge, a leak
at any line fitting or component seal is likely. To de-
tect a leak in the refrigerant system, perform one of
the following procedures as indicated by the symp-
toms.
EMPTY REFRIGERANT SYSTEM LEAK TEST
CAUTION: Review Safety Precautions and Warnings
in General Information section of this Group.
(1) Evacuate the refrigerant system to the lowest
degree of vacuum possible. (2) Prepare a 10 oz. refrigerant (R-12) charge to be
injected into the system. Refer to Charging Refriger-
ant System for instructions. (3) Connect and dispense 10 ozs. of refrigerant into
the evacuated refrigerant system. (4) Proceed to step two of Low Refrigerant Level
Leak Test.
LOW REFRIGERANT LEVEL LEAK TEST
Caution: Review Safety Precautions and Warnings
in the General Information section of this group.
(1) Using the refrigerant level sight glass, deter-
mine if there is any (R-12) refrigerant in the system. (2) Position the vehicle in a wind free work area.
This will aid in detecting small leaks. (3) Bring the refrigerant system up to operating
temperature and pressure. This is done by allowing
the engine to run for five minutes. (4) With the engine not running, use an Electronic
Leak Detector (or equivalent) and search for leaks.
Fittings, lines, or components that appear to be oily
usually will indicate a refrigerant leak. To inspect
the evaporator core for leaks, it is possible to insert
the leak detector probe into the recirculating air door
opening (Fig. 6).
ADDING PARTIAL REFRIGERANT CHARGE
After all leaks have been corrected and it was not
necessary to empty the refrigerant system, a partial
refrigerant charge can be added.
CAUTION:Review all Safety Precautions and Warn-
ings before attempting to add refrigerant to the sys-
tem. Do not add refrigerant to a system that is
known to have a leak.
Fig. 5 Discharge Hose Adapter
24 - 10 HEATING AND AIR CONDITIONING Ä

(1) Attach manifold gauge set.
(2) Open the windows of the passenger compart-
ment and set the air conditioning controls to A/C,
RECIRC, and Low blower speed. (3) Start the engine and allow it to warm up to
normal running temperature. (4) If the air conditioning compressor does not en-
gage, disconnect the low pressure cut-off switch.
Place a jumper wire across the terminals in the con-
nector boot. If the compressor still does not engage, a
problem exists in the compressor clutch feed circuit. (6) Hold the engine speed at 1400 rpm.
(7) Following the instructions provided with the
charging equipment being used. Charge through the
suction side of the system. Use enough refrigerant to
clear the sight glass in the filter drier. (8) At the point when the sight glass clears, note
the weight of the refrigerant supply drum or the
level in the charging cylinder. Then add an addi-
tional 340 g (12 oz) of refrigerant to the system. Re- move the jumper wire from the low pressure cut-off
switch connector and connect the cut-off switch.
(9) Test the over all performance of the air condi-
tioner as described in A/C Overall Performance Test
in this Group. Close all valves on the charging equip-
ment and disconnect the hoses from the service ports
as described in the Manifold Gauge Set Connections
section of this Group. Install the service port caps.
DISCHARGING REFRIGERANT SYSTEM
(R-12) refrigerant is a chlorofluorocarbon (CFC)
that can contribute to the depletion of the ozone
layer in the upper atmosphere. To help protect the
ozone layer, an R-12 refrigerant recycling device
must be used. Use this device when it is necessary to
empty the refrigerant system. Contact an automotive
service equipment supplier for refrigerant recycling
equipment. Refer to the operating instructions pro-
vided with the recycling equipment for proper opera-
tion.
EVACUATING REFRIGERANT SYSTEM
If the A/C system has been open to the atmosphere,
it must be evacuated before the system can be
charged. Moisture and air mixed with the refrigerant
will raise the compressor head pressure above accept-
able operating levels. This will reduce the perfor-
mance of the air conditioner and damage the
compressor. Moisture will boil at near room temper-
ature when exposed to vacuum. To evacuate the re-
frigerant system: (1) Connect a suitable charging station, refrigerant
recovery machine, and a manifold gauge set with
vacuum pump. (2) Open the suction and discharge valves and
start the vacuum pump. When the suction gauge
reads -88 kPa (-26 in. Hg) vacuum or greater, close
all valves and turn off vacuum pump. If the system
fails to reach specified vacuum, the refrigerant sys-
tem likely has a leak that must be corrected. If the
refrigerant system maintains specified vacuum for at
least 30 minutes, start the vacuum pump. Then open
the suction and discharge valves, and allow the sys-
tem to evacuate an additional 10 minutes. (3) Close all valves. Turn off and disconnect the
vacuum pump. The refrigerant system is prepared to be charged
with refrigerant.
CHARGING REFRIGERANT SYSTEMÐEMPTY
SYSTEM
CAUTION: Do not over charge refrigerant system,
as excessive compressor head pressure can cause
noise and system failure.
Fig. 6 Testing for A/C LeaksÐTypical Front/Rear A/C System
Ä HEATING AND AIR CONDITIONING 24 - 11