1998 DODGE RAM 1500 lock

(2) Snap the top edge of the bezel into place fully.
(3) Seat the two bottom clips fully.
(4) Install the two top screws.
(5) Install the center bezel (Refer to 23 - BODY/
INSTRUMENT PANEL/INSTRUMENT PANEL
CENTER BEZEL - INSTALLATION)
(6) Install the headlamp switch bezel. (Refer to 23
- BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL SWITCH BEZEL - INSTALLATION)
ASH RECEIVER
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.(1) Open ash receiver and place hand inside. (Fig.
2)
(2) Apply force with anabruptdownward motion
and roll rearward. (Fig. 3)
(3) Dislodge and roll ash receiver out of panel to
remove.
Fig. 1 CLUSTER BEZEL
1 - INSTRUMENT PANEL
2 - SCREWS (2)
3 - CLUSTER BEZEL
4 - CLIP FASTENERS (2)
Fig. 2 ASH RECEIVER
1 - ASH RECEIVER
2 - CUP HOLDER
Fig. 3 ASH RECEIVER REMOVAL
1 - LOCKING TABS
2 - CUP HOLDER
3 - ASH RECEIVER
23 - 50 INSTRUMENT PANELDR
CLUSTER BEZEL (Continued)

(3) Using a trim stick C-4755 or equivalent,
remove the center seat belt trim bezel, if equipped.
(4) On quad cab models, remove the left lower
c-pillar trim panel. (Refer to 23 - BODY/INTERIOR/
C-PILLAR TRIM - REMOVAL)
(5) On standard cab models, remove the left lower
b-pillar trim panel. (Refer to 23 - BODY/INTERIOR/
B-PILLAR LOWER TRIM - REMOVAL)
(6) Remove the push pin fasteners, if equipped,
and remove the back panel trim. (Fig. 16) or (Fig. 17)
INSTALLATION
(1) Position the back panel trim behind the right
pillar trim.
(2) Route the center belt and trim bezel through
the back panel, if equipped.
(3) On standard cab models, install the left lower
b-pillar trim panel. (Refer to 23 - BODY/INTERIOR/
B-PILLAR LOWER TRIM - INSTALLATION)
(4) On quad cab models, install the left lower c-pil-
lar trim panel. (Refer to 23 - BODY/INTERIOR/C-
PILLAR TRIM - INSTALLATION)
(5) Position the center belt trim bezel, if equipped,
and seat the attachment clips fully.
(6) Install the utility hooks/bin latch and screws, if
equipped.
(7) Install the child seat tethers, if equipped.
(Refer to 8 - ELECTRICAL/RESTRAINTS/CHILD
TETHER - INSTALLATION)
REAR VIEW MIRROR
REMOVAL
(1) If equipped, disconnect mirror harness connec-
tor.
(2) Loosen the mirror base setscrew (Fig. 18).
(3) Slide the mirror base upward and off the
bracket.
Fig. 15 UTILITY HOOK/STORAGE BIN LATCH
1 - SCREW
2 - UTILITY HOOK
3 - UTILITY HOOK COVER
4 - COVER LOCK TAB
Fig. 16 CAB BACK PANEL - STANDARD CAB
1 - CAB BACK PANEL
2 - CAB BACK
3 - UTILITY HOOK
4 - STORAGE BIN LATCH
Fig. 17 CAB BACK PANEL - QUAD CAB
1 - PUSH PIN FASTENER
2 - CAB BACK
3 - CAB BACK PANEL
4 - PUSH PIN FASTENER
DRINTERIOR 23 - 69
REAR CAB BACK PANEL TRIM (Continued)

(1) Position the hinge cover over the hinge and
close over the lock tabs.
(2) Install the pivot bolt and tighten to 10 N´m (89
in. lbs.).
(3) Reposition the storage bin/cushion cover.
(4) Connect the zip strip.
CENTER SEAT BACK HINGE
REMOVAL
NOTE: Do not reuse the seat fasteners, always
replace with new ones.
(1) Remove the seat back. (Refer to 23 - BODY/
SEATS/CENTER ARMREST / SEAT BACK -
REMOVAL)
Free Pivot Hinge/Cover
(1) Disconnect the storage bin/cushion cover j-strap
and position aside.
(2) Remove and discard the pivot bolt. (Fig. 7)
(3) Remove the hinge spacer. (Fig. 8)
(4) Open the hinge cover flap and remove the wire
harness, if equipped. (Fig. 9)
(5) Remove the cover from the hinge.
Fig. 7 PIVOT HINGE/COVER
1 - PIVOT BOLT
2 - HINGE COVER
3 - STORAGE BIN COVER
4 - 12V POWER SUPPLY HARNESS
5 - HINGE BOLTS (2)
6 - HINGE
Fig. 8 PIVOT HINGE SPACER
1 - HINGE COVER
2 - SPACER
3-STOPPIN
Fig. 9 PIVOT HINGE COVER
1 - HINGE COVER FLAP
2-STOPPIN
3 - HINGE COVER
4 - HINGE
5 - 12V POWER SUPPLY HARNESS
23 - 78 SEATSDR
CENTER SEAT BACK INERTIA HINGE COVER (Continued)

WINDSHIELD
WARNING
WINDSHIELD SAFETY PRECAUTIONS
WARNING: DO NOT OPERATE THE VEHICLE
WITHIN 24 HOURS OF WINDSHIELD INSTALLATION.
IT TAKES AT LEAST 24 HOURS FOR URETHANE
ADHESIVE TO CURE. IF IT IS NOT CURED, THE
WINDSHIELD MAY NOT PERFORM PROPERLY IN
AN ACCIDENT.
²URETHANE ADHESIVES ARE APPLIED AS A
SYSTEM. USE GLASS CLEANER, GLASS PREP
SOLVENT, GLASS PRIMER, PVC (VINYL) PRIMER
AND PINCH WELD (FENCE) PRIMER PROVIDED BY
THE ADHESIVE MANUFACTURER. IF NOT, STRUC-
TURAL INTEGRITY COULD BE COMPROMISED.
²DAIMLERCHRYSLER DOES NOT RECOMMEND
GLASS ADHESIVE BY BRAND. TECHNICIANS
SHOULD REVIEW PRODUCT LABELS AND TECHNI-
CAL DATA SHEETS, AND USE ONLY ADHESIVES
THAT THEIR MANUFACTURES WARRANT WILL
RESTORE A VEHICLE TO THE REQUIREMENTS OF
FMVSS 212. TECHNICIANS SHOULD ALSO INSURE
THAT PRIMERS AND CLEANERS ARE COMPATIBLE
WITH THE PARTICULAR ADHESIVE USED.
²BE SURE TO REFER TO THE URETHANE MAN-
UFACTURER'S DIRECTIONS FOR CURING TIME
SPECIFICATIONS, AND DO NOT USE ADHESIVE
AFTER ITS EXPIRATION DATE.
²VAPORS THAT ARE EMITTED FROM THE URE-
THANE ADHESIVE OR PRIMER COULD CAUSE
PERSONAL INJURY. USE THEM IN A WELL-VENTI-
LATED AREA.
²SKIN CONTACT WITH URETHANE ADHESIVE
SHOULD BE AVOIDED. PERSONAL INJURY MAY
RESULT.
²ALWAYS WEAR EYE AND HAND PROTECTION
WHEN WORKING WITH GLASS.
CAUTION: Protect all painted and trimmed surfaces
from coming in contact with urethane or primers.
Be careful not to damage painted surfaces when
removing moldings or cutting urethane around
windshield.
REMOVAL
(1) Remove inside rear view mirror. (Refer to 23 -
BODY/INTERIOR/REAR VIEW MIRROR -
REMOVAL).
(2) Remove cowl grill. (Refer to 23 - BODY/EXTE-
RIOR/COWL GRILLE - REMOVAL).(3) Remove the a-pillar weatherstrip retainer.
(Refer to 23 - BODY/WEATHERSTRIP/SEALS/A-
PILLAR WEATHERSTRIP RETAINER - REMOVAL)
(4) Remove the a-pillar trim panels. (Refer to 23 -
BODY/INTERIOR/A-PILLAR TRIM - REMOVAL)
(5) Remove the headliner and from the inside of
the vehicle, cut the upper urethane bonding from
around windshield upper edge using a suitable sharp
cold knife (C-4849). A pneumatic cutting device can
be used but is not recommended. (Refer to 23 -
BODY/INTERIOR/HEADLINER - REMOVAL)
(6) From the outside of the vehicle, cut urethane
bonding from the remaining sides of the windshield
using a suitable sharp cold knife (C-4849). A pneu-
matic cutting device can be used but is not recom-
mended.
(7) Separate windshield from vehicle.
INSTALLATION
WARNING: Allow the urethane at least 24 hours to
cure before returning the vehicle to use.
CAUTION: Roll down the left and right front door
glass and open the rear glass slider (if available)
before installing windshield to avoid pressurizing
the passenger compartment if a door is slammed
before urethane is cured. Water leaks can result.
The windshield fence should be cleaned of most of
its old urethane bonding material. A small amount of
old urethane, approximately 1-2 mm in height,
should remain on the fence. Do not grind off or com-
pletely remove all old urethane from the fence, the
paint finish and bonding strength will be adversely
affected.
(1) Place replacement windshield into windshield
opening and position glass in the center of the open-
ing against the support spacers. Mark the outside
surface of the glass at the support spacers with a
grease pencil or pieces of masking tape and ink pen
to use as a reference for installation. Remove replace-
ment windshield from windshield opening (Fig. 5).
(2) Position the windshield inside up on a suitable
work surface with two padded, wood 10 cm by 10 cm
by 50 cm (4 in. by 4 in. by 20 in.) blocks, placed par-
allel 75 cm (2.5 ft.) apart (Fig. 6).
(3) Clean inside of windshield with MOPAR Glass
Cleaner and lint-free cloth.
(4) Apply clear glass primer 25 mm (1 in.) wide
around perimeter of windshield and wipe with a new
clean and dry lint- free cloth.
(5) Apply black-out primer onto the glass using the
windshield molding as a guide. The primer should be
15 mm (5/8 in.) wide on the top and sides of the glass
23 - 88 STATIONARY GLASSDR

and 25 mm (1 in.) on the bottom of windshield. Allow
at least three minutes drying time.
(6) Locatenewsupport spacers on support brack-
ets and adjust to lowest height. (Fig. 5)
(7) Position seven new foam spacers on the inside
surface of the windshield, flush with the lower and
side edges. (Fig. 7)
(8) Position three new foam spacers on the inside
surface of the windshield, at a minimum distance of
3 mm (0.12 in.) from the top edge of the windshield.
(Fig. 7)
(9) Apply a 13 mm (1/2 in.) high and 10 mm (3/8
in.) wide bead of urethane around the perimeter of
windshield. At the top, apply the bead 7 mm (1/4 in.)
inboard from the glass edge. On the other three sides
apply the bead 14 mm (0.55 in.) inboard from the
glass edge. The urethane bead should be shaped in a
triangular cross-section, this can be achieved by
notching the tip of the applicator (Fig. 8).
(10) Install the a-pillar trim. (Refer to 23 - BODY/
INTERIOR/A-PILLAR TRIM - INSTALLATION)
(11) With the aid of a helper, position the wind-
shield over the windshield opening. Align the refer-
ence marks at the bottom of the windshield to the
support spacers.
(12) Slowly lower windshield glass to the fence
opening guiding the lower corners into proper posi-
tion. Beginning at the bottom and continuing to the
top, push glass onto fence along the A-Pillars. Push
windshield inward to the fence at the bottom corners
(Fig. 9).
(13) Push windshield upward, setting the wind-
shield to roof gap to 1.5 mm (0.06 in.) to 3 mm (0.12
in.) and ratchet up the adjustable support brackets.
(14) Using clean water, lightly mist the support
spacers.
(15) Clean excess urethane from exterior with
MOPARtSuper Clean or equivalent.
(16) Install cowl grill. (Refer to 23 - BODY/EXTE-
RIOR/COWL GRILLE - INSTALLATION).
(17) Install rear view mirror support bracket.
(Refer to 23 - BODY/INTERIOR/REAR VIEW MIR-
ROR - INSTALLATION).
(18) Install rear view mirror. (Refer to 23 - BODY/
INTERIOR/REAR VIEW MIRROR - INSTALLA-
TION).
(19) Install the a-pillar weatherstrip retainer.
(Refer to 23 - BODY/WEATHERSTRIP/SEALS/A-
PILLAR WEATHERSTRIP RETAINER - INSTALLA-
TION)
(20) After urethane has cured, remove tape strips
and water test windshield to verify repair.
Fig. 5 CENTER WINDSHIELD AND MARK AT
SUPPORT
1 - WINDSHIELD
2 - INDEX MARKS
3 - SUPPORT SPACERS
Fig. 6 WORK SURFACE SET UP
1 - WINDSHIELD AND MOLDINGS
2 - URETHANE BEAD AROUND GLASS 7mm (0.3 in.) FROM
EDGE
3 - BLOCKS
DRSTATIONARY GLASS 23 - 89
WINDSHIELD (Continued)

HEATING & AIR CONDITIONING
TABLE OF CONTENTS
page page
HEATING & AIR CONDITIONING
DESCRIPTION
DESCRIPTION - ENGINE COOLING
SYSTEM REQUIREMENTS...............1
DESCRIPTION - HEATER AND AIR
CONDITIONER........................1
OPERATION - HEATER AND AIR
CONDITIONER........................1
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - A/C
PERFORMANCE.......................3DIAGNOSIS AND TESTING - HEATER
PERFORMANCE TEST..................6
SPECIFICATIONS - A/C SYSTEM............7
CONTROLS.............................9
DISTRIBUTION..........................26
PLUMBING.............................41
HEATING & AIR
CONDITIONING
DESCRIPTION
DESCRIPTION - ENGINE COOLING SYSTEM
REQUIREMENTS
To maintain the performance level of the heating,
ventilation and air conditioning (HVAC) system, the
engine cooling system must be properly maintained.
The use of a bug screen is not recommended. Any
obstructions in front of the radiator or A/C condenser
will reduce the performance of the A/C and engine
cooling systems.
The engine cooling system includes the radiator,
thermostat, radiator hoses and the engine coolant
pump. Refer to Cooling for more information before
opening or attempting any service to the engine cool-
ing system.
DESCRIPTION - HEATER AND AIR
CONDITIONER
A manually controlled single zone type heating-air
conditioning system or a manually controlled dual
zone type heating-air conditioning system is available
on this model.
All vehicles are equipped with a common heater,
ventilation and air conditioning (HVAC) housing (Fig.
1). The system combines air conditioning, heating,
and ventilating capabilities in a single unit housing
mounted within the passenger compartment under
the instrument panel. The HVAC housing includes:
²Blower motor
²Blower motor resistor block²Heater core
²Evaporator coil
²Blend door and actuator
²Defrost door and actuator
²Mode door and actuator
²Recirculation door and actuator
Based upon the system and mode selected, condi-
tioned air can exit the HVAC housing through one or
a combination of the three main housing outlets:
defrost, panel or floor. The defrost outlet is located on
the top of the housing, the panel outlet is located on
the face of the housing and the floor outlet is located
on the bottom of the housing. Once the conditioned
air exits the unit housing, it is further directed
through molded plastic ducts to the various outlets in
the vehicle interior. These outlets and their locations
are as follows:
²Defroster Outlet- A single large defroster out-
let is located in the center of the instrument panel
top cover, near the base of the windshield.
²Side Window Demister Outlets- There are
two side window demister outlets, one is located at
each outboard end of the instrument panel top cover,
near the belt line at the A-pillars.
²Panel Outlets- There are four panel outlets in
the instrument panel, one located near each outboard
end of the instrument panel facing the rear of the
vehicle and two located near the top of the instru-
ment panel center bezel.
²Front Floor Outlets- There are two front floor
outlets, one located above each side of the floor panel
center tunnel near the dash panel.
OPERATION - HEATER AND AIR CONDITIONER
The heating and air conditioning systems pulls
outside (ambient) air through the cowl opening at the
base of the windshield, then into the plenum cham-
DRHEATING & AIR CONDITIONING 24 - 1

PERFORMANCE TEMPERATURE AND PRESSURE
Ambient Air
Temperature21É C
(70É F)27É C
(80É F)32É C
(90É F)38É C
(100É F)43É C
(110É F)
Air Temperature at
Center Panel Outlet7É C
(45É F)7É C
(45É F)13É C
(55É F)13É C
(55É F)18É C
(64É F)
Compressor Inlet
Pressure at Service
Port (low Side)138 to 207 kPa
(20 to 30 psi)172 to 241 kPa
(25 to 35 psi)207 to 276
kPa
(30 to 40 psi)241 to 310
kPa
(35 to 45 psi)276 to 345 kPa
(40 to 50 psi)
Compressor
Discharge Pressure at
Service Port (High
Side)1034 to 1724
kPa
(150 to 250
psi)1379 to 2068
kPa
(200 to 300
psi)1724 to 2413
kPa
(250 to 350
psi)1999 to 2689
kPa
(290 to 390
psi)2413 to 2965
kPa
(350 to 430 psi)
(9) Compare the compressor discharge pressure to
the Performance Temperature and Pressure chart. Ifthe compressor discharge pressure is high, see the
Pressure Diagnosis chart.
PRESSURE DIAGNOSIS
Condition Possible Causes Correction
Constant compressor
engagement and warm air
from passenger vents.1. Low refrigerant system
charge.1. See Refrigerant System Leaks in this group.
Test the refrigerant system for leaks. Repair,
evacuate and charge the refrigerant system, if
required.
Equal pressures, but the
compressor clutch does not
engage.1. No refrigerant in the
refrigerant system.1. See Refrigerant System Leaks in this group.
Test the refrigerant system for leaks. Repair,
evacuate and charge the refrigerant system, if
required.
2. Faulty fuse. 2. Check the fuses in the Power Distribution
Center and the junction block. Repair the shorted
circuit or component and replace the fuses, if
required.
3. Faulty A/C compressor
clutch coil.3. See A/C Compressor Clutch Coil in this group.
Test the compressor clutch coil and replace, if
required.
4. Faulty A/C compressor
clutch relay.4. See A/C Compressor Clutch Relay in this
group. Test the compressor clutch relay and relay
circuits. Repair the circuits or replace the relay, if
required.
5. Improperly installed or
faulty Evaporator
Temperature Sensor.5. See Evaporator Temperature Sensor in this
group. Reinstall or replace the sensor as
required.
6. Faulty A/C pressure
transducer.6. See A/C pressure transducer in this group.
Test the switch and replace, if required.
7. Faulty Powertrain Control
Module (PCM).7. (Refer to Appropriate Diagnostic Information).
Test the PCM and replace, if required.
24 - 4 HEATING & AIR CONDITIONINGDR
HEATING & AIR CONDITIONING (Continued)

²Faulty A/C-heater control.
²Faulty related wiring harness or connectors.
²Improper engine coolant temperature.
SPECIFICATIONS - A/C SYSTEM
The R-134a refrigerant system charge capacity for
this vehicle can be found on the underhood Specifica-
tion Label.
A/C SYSTEM SPECIFICATION CHART
Item Description Notes
Compressor Saden SD-7
(5.9L engine)SP-15 PAG oil
Denso 10S17
(3.7L/4.7L/5.7L
engines)ND-8 PAG oil
Freeze±up
ControlEvaporator
Temperature
SensorEvaporator coil
mounted
High psi Control A/C pressure
transducerDischarge line
mounted
Compressor
Clutch Coil
Draw2 - 3.9 amps @
12V   0.5V @
21É C (70É F)5.9L engine
2.2 amps @
12V   0.5V @
21É C (70É F)3.7L/4.7L/5.7L
engines
Compressor
Clutch Air Gap0.41 - 0.79 mm
(0.016 - 0.031
in.)5.9L engine
0.35 - 0.65 mm
(0.013 - 0.025
in.)3.7L/4.7L/5.7L
engines
TORQUE SPECIFICATIONS
Description N´m Ft. Lbs. In. Lbs.
A/C Compressor Shaft Nut 15-20 11-15 ±
A/C Compressor Bolt-Inner
Front-3.7L,4.7L40 30 ±
A/C Compressor Bolt-Inner
Rear-3.7L,4.7L55 41 ±
A/C Compressor Rear Bolt-
3.7L,4.7L55 41 ±
A/C Compressor Lower Bolts-5.7L 40 30 ±
A/C Compressor Rear Bolt-5.7L 55 41 ±
A/C Compressor Bolts-5.9L Diesel 24 17 ±
A/C Compressor Clutch Coil Wire
Retainer Screw2.2 ± 20
A/C-Heater Control Screws 2.2 ± 20
Accumulator Bracket Bolts 4.5 ± 40
Blower Motor Screws 2.2 ± 20
Blower Motor Resistor Block
Screws2.2 ± 20
Center Distribution Duct Screws 2.2 ± 20
DRHEATING & AIR CONDITIONING 24 - 7
HEATING & AIR CONDITIONING (Continued)