1998 DODGE RAM 1500 ECU

(5) Install the interior handle. (Refer to 23 -
BODY/DOOR - FRONT/INSIDE HANDLE ACTUA-
TOR - INSTALLATION)
(6) Install the window crank, if equipped.
WATERDAM
REMOVAL
CAUTION: Do not allow the waterdam or adhesive
to become contaminated with dirt or other foreign
substances.
Do not damage the waterdam during removal and
installation.
If the waterdam becomes contaminated or dam-
aged, replace the waterdam.
(1) Remove the inside handle actuator. (Refer to 23
- BODY/DOOR - FRONT/INSIDE HANDLE ACTUA-
TOR - REMOVAL)
(2) Remove the speaker. (Refer to 8 - ELECTRI-
CAL/AUDIO/SPEAKER - REMOVAL)
(3) Separate the waterdam from the inner door
panel and off of the latch linkages.
INSTALLATION
CAUTION: Do not allow the waterdam or adhesive
to become contaminated with dirt or other foreign
substances.
Do not damage the waterdam during removal and
installation.
If the waterdam becomes contaminated or dam-
aged, replace the waterdam.(1) Position the wire harness and actuator rods
through the holes in the waterdam.
(2) Secure the waterdam to the inner door panel.
(3) Install the speaker. (Refer to 8 - ELECTRICAL/
AUDIO/SPEAKER - INSTALLATION)
(4) Install the inside handle actuator. (Refer to 23 -
BODY/DOOR - FRONT/INSIDE HANDLE ACTUA-
TOR - INSTALLATION)
WINDOW REGULATOR -
POWER
REMOVAL
(1) Remove the waterdam. (Refer to 23 - BODY/
DOOR - FRONT/WATERDAM - REMOVAL)
(2) Remove the window switch from the door trim
panel and reconnect it to the door harness.
(3) Raise the window to the position shown and
remove the nuts. (Fig. 14)
(4) Disengage the door glass from the regulator lift
plate and position into the full up position.
(5) Secure the glass in the up position using a
wood wedge or equivalent.
(6) Lower the regulator.
(7) Remove the stabilizer nuts.
(8) Remove the forward regulator bolt and loosen
the other two. (Fig. 15)
(9) Slide the regulator up and out of the keyhole
slots in the door panel.
(10) Disconnect the electrical connector and
remove the regulator.Fig. 13 WINDOW CRANK REMOVAL TOOL
1 - WINDOW CRANK REMOVAL TOOL
2 - WINDOW CRANK
Fig. 14 DOOR GLASS POSITIONING
1 - SIGHT WINDOW
2 - WIDOW REGULATOR
3 - SIGHT WINDOW
4 - REGULATOR STABILIZER
DRDOOR - FRONT 23 - 25
TRIM PANEL (Continued)

INSTALLATION
(1) Install the regulator through the door panel
opening and connect the electrical connector.
(2) Position the regulator bolts into the keyhole
slots and slide into place.
(3) Install the forward bolt and tighten all three to
10 N´m (89 in. lbs.).
(4) Position the stabilizer, install the nuts and
tighten to 10 N´m (89 in. lbs.).
(5) Raise the regulator to the position shown in
(Fig. 14).
(6) Remove the glass support and connect to the
regulator lift plate.
(7) Install the glass nuts and tighten to 10 N´m
(89 in. lbs.).
(8) Disconnect the window switch and install into
the door trim panel.
(9) Install the waterdam. (Refer to 23 - BODY/
DOOR - FRONT/WATERDAM - INSTALLATION)
WINDOW REGULATOR -
MANUAL
REMOVAL
(1) Remove the waterdam. (Refer to 23 - BODY/
DOOR - FRONT/WATERDAM - REMOVAL)
(2) Reinstall the window handle and raise the win-
dow to the position shown and remove the nuts. (Fig.
14)
(3) Disengage the door glass from the regulator lift
plate and position into the full up position.
(4) Secure the glass in the up position using a
wood wedge or equivalent.
(5) Lower the regulator.
(6) Remove the stabilizer nuts.
(7) Remove the two lower and loosen the two
upper bolts. (Fig. 16)
(8) Slide the regulator up and out of the keyhole
slot.
(9) Remove the regulator from the door panel
opening.
Fig. 15 WINDOW REGULATOR - POWER
1 - REGULATOR STABILIZER
2 - INNER DOOR PANEL
3 - STABILIZER NUTS (2)
4 - REGULATOR
5 - FORWARD BOLT
6 - WIRE HARNESS
7 - BOLTS (2)
Fig. 16 WINDOW REGULATOR - MANUAL
1 - DOOR
2 - REGULATOR BOLTS (4)
3 - REGULATOR
4 - STABILIZER NUTS (2)
23 - 26 DOOR - FRONTDR
WINDOW REGULATOR - POWER (Continued)

DOOR GLASS
REMOVAL
(1) Remove the glass run channels. (Refer to 23 -
BODY/DOORS - REAR/GLASS RUN CHANNEL -
REMOVAL)
(2) Remove the glass support and place the glass
into the bottom of the door.
(3) Separate the glass run weatherstrip from the
rear of the window opening.
(4) Remove the inner belt molding. (Refer to 23 -
BODY/WEATHERSTRIP/SEALS/FRONT DOOR
INNER BELT WEATHERSTRIP - REMOVAL)
(5) Remove the glass from the window opening.
INSTALLATION
(1) Install the glass through the window opening
and pace the glass into the bottom of the door.
(2) Install the inner belt molding. (Refer to 23 -
BODY/WEATHERSTRIP/SEALS/FRONT DOOR
INNER BELT WEATHERSTRIP - INSTALLATION)
(3) Stuff the glass run weatherstrip into the win-
dow frame.
(4) Secure the glass in the up position using a
wood wedge or equivalent.
(5) Install the glass run channels. (Refer to 23 -
BODY/DOORS - REAR/GLASS RUN CHANNEL -
INSTALLATION)
EXTERIOR HANDLE
REMOVAL
(1) Remove the front glass run channel. (Refer to
23 - BODY/DOORS - REAR/GLASS RUN CHANNEL
- REMOVAL)
(2) Disconnect the latch actuator rod. (Fig. 2)
(3) Remove the nuts and remove the handle.
INSTALLATION
(1) Install the latch and install the nuts.
(2) Connect the latch actuator rod.
(3) Install the front glass run channel. (Refer to 23
- BODY/DOORS - REAR/GLASS RUN CHANNEL -
INSTALLATION)
GLASS RUN CHANNEL
REMOVAL
(1) Remove the window regulator. (Refer to 23 -
BODY/DOORS - REAR/WINDOW REGULATOR -
REMOVAL)
(2) Remove the bottom screws and loosen the top
screws from bolt channels. (Fig. 3) and (Fig. 4)(3) Slide the channels up to disengage from the
keyhole slots.
(4) Separate the glass run weatherstrip from the
channel and remove the channels.
Fig. 2 EXTERIOR HANDLE
1 - LATCH ACTUATOR ROD
2-LATCH
3 - NUTS (2)
Fig. 3 FRONT RUN CHANNEL
1 - BOLTS
2 - FRONT RUN CHANNEL
23 - 30 DOORS - REARDR

(4) Install the interior handle. (Refer to 23 -
BODY/DOORS - REAR/INSIDE HANDLE ACTUA-
TOR - INSTALLATION)
(5) Install the window crank, if equipped.
WATERDAM
REMOVAL
(1) Remove the inside handle actuator. (Refer to 23
- BODY/DOORS - REAR/INSIDE HANDLE ACTUA-
TOR - REMOVAL)
(2) Remove the speaker. (Refer to 8 - ELECTRI-
CAL/AUDIO/SPEAKER - REMOVAL)
(3) Separate the waterdam from the inner door
panel and off of the latch linkages.
INSTALLATION
(1) Position the wire harness and actuator rods
through the holes in the waterdam.
(2) Secure the waterdam to the inner door panel.
(3) Install the speaker. (Refer to 8 - ELECTRICAL/
AUDIO/SPEAKER - INSTALLATION)
(4) Install the inside handle actuator. (Refer to 23 -
BODY/DOORS - REAR/INSIDE HANDLE ACTUA-
TOR - INSTALLATION)
WINDOW REGULATOR -
POWER
REMOVAL
(1) Remove the waterdam. (Refer to 23 - BODY/
DOORS - REAR/WATERDAM - REMOVAL)
(2) Remove the window switch from the door trim
panel and reconnect it to the door wire harness.(3) Raise the window to the position shown and
remove the two nuts attaching the glass to the win-
dow regulator. (Fig. 11)
(4) Remove the stabilizer nut.
(5) Disengage the door glass from the regulator lift
plate and position into the full up position.
(6) Secure the glass in the up position using a
wood wedge or equivalent.
(7) Lower the regulator.
(8) Disconnect the electrical connector. (Fig. 12)
(9) Remove the lower regulator bolt and loosen the
upper two. (Fig. 12)
(10) Slide the regulator up and out of the keyhole
slots in the door panel.
(11) Remove the regulator through the hole in the
inner door panel.
INSTALLATION
(1) Install the regulator through the hole in the
inner door panel.
(2) Position the regulator bolts into the keyhole
slots and slide into place.
(3) Install the lower regulator bolt and tighten all
three to 10 N´m (89 in. lbs.).
(4) Connect the electrical connector.
(5) Position the stabilizer, install the nut and
tighten to 10 N´m (89 in. lbs.).
(6) Raise the regulator to the position shown in
(Fig. 11).
(7) Remove the glass support and connect to the
regulator lift plate.
(8) Install the glass nuts and tighten to 10 N´m
(89 in. lbs.).
(9) Disconnect the window switch and install into
the door trim panel.
Fig. 10 WINDOW CRANK REMOVAL TOOL
1 - WINDOW CRANK REMOVAL TOOL
2 - WINDOW CRANK
Fig. 11 GLASS POSITIONING
1 - SIGHT WINDOW
2 - STABILIZER NUT
3 - GLASS LIFT PLATE
23 - 34 DOORS - REARDR
TRIM PANEL (Continued)

(10) Install the waterdam. (Refer to 23 - BODY/
DOORS - REAR/WATERDAM - INSTALLATION)
WINDOW REGULATOR -
MANUAL
REMOVAL
(1) Remove the waterdam. (Refer to 23 - BODY/
DOORS - REAR/WATERDAM - REMOVAL)
(2) Reinstall the window handle and raise the win-
dow to the position shown and remove the nuts. (Fig.
11 )
(3) Remove the stabilizer nuts. (Fig. 13)
(4) Disengage the door glass from the regulator lift
plate and position into the full up position.
(5) Secure the glass in the up position using a
wood wedge or equivalent.
(6) Lower the regulator.
(7) Remove the two back regulator bolts and
loosen the front two.
(8) Slide the regulator up and out of the keyhole
slots in the door panel.
(9) Remove the regulator through the hole in the
inner door panel.
INSTALLATION
(1) Install the regulator through the hole in the
inner door panel.
(2) Position the regulator bolts into the keyhole
slots and slide into place.
(3) Install the back regulator bolts and tighten all
four to 10 N´m (89 in. lbs.).
(4) Position the stabilizer, install the nuts and
tighten to 10 N´m (89 in. lbs.).
(5) Using the window handle raise the regulator to
the position shown in (Fig. 11).
(6) Remove the glass support and connect to the
regulator lift plate.
(7) Install the glass nuts and tighten to 10 N´m
(89 in. lbs.).
(8) Disconnect the window switch and install into
the door trim panel.
(9) Using the window handle raise the regulator to
the position shown in (Refer to 23 - BODY/DOORS -
REAR/WATERDAM - INSTALLATION)
Fig. 12 WINDOW REGULATOR MOTOR
1 - REGULATOR BOLTS
2 - REGULATOR MOTOR
3 - ELECTRICAL CONNECTOR.
Fig. 13 WINDOW REGULATOR - MANUAL
1 - DOOR
2 - REGULATOR BOLTS (4)
3 - STABILIZER NUTS (2)
4 - REGULATOR
DRDOORS - REAR 23 - 35
WINDOW REGULATOR - POWER (Continued)

STATIONARY GLASS
TABLE OF CONTENTS
page page
BACKLITE
REMOVAL.............................86
INSTALLATION.........................86
BACKLITE VENT GLASS
REMOVAL.............................87
INSTALLATION.........................87WINDSHIELD
WARNING
WINDSHIELD SAFETY PRECAUTIONS.....88
REMOVAL.............................88
INSTALLATION.........................88
BACKLITE
REMOVAL
It is difficult to salvage the backlite during the
removal operation. The backlite is part of the struc-
tural support for the roof. The urethane bonding
used to secure the glass to the fence is difficult to cut
or clean from any surface. Since the molding is set in
urethane, it is unlikely it would be salvaged. Before
removing the backlite, check the availability from the
parts supplier.
The backlite is attached to the window frame with
urethane adhesive. The urethane adhesive is applied
cold and seals the surface area between the window
opening and the glass. The primer adheres the ure-
thane adhesive to the backlite.
(1) Roll down door glass.
(2) Remove headliner. (Refer to 23 - BODY/INTE-
RIOR/HEADLINER - REMOVAL).
(3) On standard cab models remove the upper
b-pillar trim. (Refer to 23 - BODY/INTERIOR/B-PIL-
LAR UPPER TRIM - REMOVAL)
(4) On quad cab models remove the upper c-pillar
trim. (Refer to 23 - BODY/INTERIOR/C-PILLAR
UPPER TRIM - REMOVAL)
(5) Bend backlite retaining tabs (Fig. 1) inward
against glass.
(6) Disconnect the rear window defogger electrical
connector, if equipped.
(7) Using a suitable pneumatic knife from inside
the vehicle, cut urethane holding backlite frame to
opening fence.
(8) Separate glass from vehicle.
INSTALLATION
(1) Clean urethane adhesive from around backlite
opening fence.
(2) If necessary, apply black-out primer to outer
edge of replacement backlite frame.(3) If black-out primer was pre-applied on backlite,
clean bonding surface with Isopropyl alcohol and
clean lint free cloth. Allow 3 minutes for drying time.
(4) Apply black-out primer to backlite opening
fence.
(5) Apply a 13 mm (0.5 in.) bead of urethane
around the perimeter of the window frame bonding
surface (Fig. 2).
(6) Set glass on lower fence and move glass for-
ward into opening (Fig. 3).
(7) Firmly push glass against rear window glass
opening fence.
(8) Bend tabs around edges of backlite opening
fence to retain glass.
(9) Clean excess urethane from exterior with
MOPARt, Super Clean or equivalent.
(10) Allow urethane to cure at least 24 hours (full
cure is 72 hours).
(11) Water test to verify repair before returning
vehicle to service.
(12) Connect the rear window defogger electrical
connector, if equipped.
Fig. 1 Backlite Tabs
1 - BACKLITE
2-TAB
23 - 86 STATIONARY GLASSDR

The panel outlets receive airflow from the HVAC
housing through a molded plastic main panel duct,
center panel duct and two end panel ducts. The two
end panel ducts direct airflow to the left and right
instrument panel outlets, while the center panel duct
directs airflow to the two center panel outlets. Each
of these outlets can be individually adjusted to direct
the flow of air.
The floor outlets receive airflow from the HVAC
housing through the floor distribution duct. The front
floor outlets are integral to the molded plastic floor
distribution duct, which is secured to the bottom of
the housing. The floor outlets cannot be adjusted.
The air conditioner for all models is designed for
the use of non-CFC, R-134a refrigerant. The air con-
ditioning system has an evaporator to cool and dehu-
midify the incoming air prior to blending it with the
heated air. This air conditioning system uses a fixed
orifice tube in the liquid line near the condenser out-
let tube to meter refrigerant flow to the evaporator
coil. To maintain minimum evaporator temperature
and prevent evaporator freezing, a evaporator tem-
perature sensor is used. The JTEC control module is
programmed to respond to the evaporator tempera-
ture sensor input by cycling the air conditioning com-
pressor clutch as necessary to optimize air
conditioning system performance and to protect the
system from evaporator freezing.
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - A/C
PERFORMANCE
The air conditioning system is designed to remove
heat and humidity from the air entering the passen-
ger compartment. The evaporator, located in the
HVAC housing, is cooled to temperatures near the
freezing point. As warm damp air passes over the
fins in the evaporator, moisture in the air condenses
to water, dehumidifying the air. Condensation on the
evaporator fins reduces the evaporators ability to
absorb heat. During periods of high heat and humid-
ity, an air conditioning system will be less effective.
With the instrument control set to Recirculation
mode, only air from the passenger compartment
passes through the evaporator. As the passenger com-
partment air dehumidifies, A/C performance levels
rise.
Humidity has an important bearing on the temper-
ature of the air delivered to the interior of the vehi-
cle. It is important to understand the effect that
humidity has on the performance of the air condition-
ing system. When humidity is high, the evaporator
has to perform a double duty. It must lower the air
temperature, and it must lower the temperature ofthe moisture in the air that condenses on the evapo-
rator fins. Condensing the moisture in the air trans-
fers heat energy into the evaporator fins and tubing.
This reduces the amount of heat the evaporator can
absorb from the air. High humidity greatly reduces
the ability of the evaporator to lower the temperature
of the air.
However, evaporator capacity used to reduce the
amount of moisture in the air is not wasted. Wring-
ing some of the moisture out of the air entering the
vehicle adds to the comfort of the passengers.
Although, an owner may expect too much from their
air conditioning system on humid days. A perfor-
mance test is the best way to determine whether the
system is performing up to standard. This test also
provides valuable clues as to the possible cause of
trouble with the air conditioning system.
PERFORMANCE TEST PROCEDURE
Review Safety Warnings and Cautions before per-
forming this procedure (Refer to 24 - HEATING &
AIR CONDITIONING/PLUMBING - WARNING) and
(Refer to 24 - HEATING & AIR CONDITIONING/
PLUMBING - CAUTION). Air temperature in test
room and on vehicle must be 21É C (70É F) minimum
for this test.
NOTE: When connecting the service equipment
coupling to the line fitting, verify that the valve of
the coupling is fully closed. This will reduce the
amount of effort required to make the connection.
(1) Connect a tachometer and a manifold gauge set
or A/C recycling/charging station.
(2) Set the A/C-heater mode control in the Recircu-
lation Mode position, the temperature control knob in
the full cool position, and the blower motor switch to
the highest speed position.
(3) Start the engine and hold at 1,000 rpm with
the A/C compressor clutch engaged.
(4) The engine should be warmed up to operating
temperature with the doors closed and windows
open.
(5) Insert a thermometer in the driver side center
panel A/C-heater outlet and operate the engine for
five minutes.
(6) The compressor clutch may cycle, depending
upon the ambient temperature and humidity.
(7) With the compressor clutch engaged, record the
discharge air temperature and the compressor dis-
charge pressure.
(8) If the discharge air temperature fails to meet
the specifications in the A/C Performance Tempera-
ture chart, refer to the Pressure Diagnosis chart.
DRHEATING & AIR CONDITIONING 24 - 3
HEATING & AIR CONDITIONING (Continued)

CONTROLS
TABLE OF CONTENTS
page page
A/C COMPRESSOR CLUTCH/COIL
DESCRIPTION..........................9
OPERATION............................9
DIAGNOSIS AND TESTING - A/C
COMPRESSOR CLUTCH COIL...........10
STANDARD PROCEDURE - A/C
COMPRESSOR CLUTCH BREAK-IN.......10
REMOVAL.............................10
INSPECTION..........................11
INSTALLATION.........................12
A/C COMPRESSOR CLUTCH RELAY
DESCRIPTION.........................13
OPERATION...........................13
REMOVAL.............................14
INSTALLATION.........................14
A/C HEATER CONTROL
DESCRIPTION.........................14
REMOVAL.............................15
INSTALLATION.........................15
A/C PRESSURE TRANSDUCER
DESCRIPTION.........................15
OPERATION...........................16
DIAGNOSIS AND TESTING - A/C PRESSURE
TRANSDUCER.......................16
REMOVAL.............................16
INSTALLATION.........................16
BLEND DOOR ACTUATOR
DESCRIPTION.........................17
OPERATION...........................17
REMOVAL.............................17
INSTALLATION.........................18
BLOWER MOTOR RESISTOR BLOCK
DESCRIPTION.........................18OPERATION...........................18
DIAGNOSIS AND TESTING - BLOWER
MOTOR RESISTOR BLOCK..............19
REMOVAL.............................19
INSTALLATION.........................19
BLOWER MOTOR SWITCH
DESCRIPTION.........................20
OPERATION...........................20
DIAGNOSIS AND TESTING - BLOWER
MOTOR SWITCH......................20
DEFROST DOOR ACTUATOR
DESCRIPTION.........................20
OPERATION...........................21
REMOVAL.............................21
INSTALLATION.........................21
EVAPORATOR TEMPERATURE SENSOR
DESCRIPTION.........................22
OPERATION...........................22
REMOVAL.............................22
INSTALLATION.........................22
MODE DOOR ACTUATOR
DESCRIPTION.........................23
OPERATION...........................23
REMOVAL.............................23
INSTALLATION.........................23
RECIRCULATION DOOR ACTUATOR
DESCRIPTION.........................24
OPERATION...........................24
REMOVAL.............................24
INSTALLATION.........................25
A/C COMPRESSOR CLUTCH/
COIL
DESCRIPTION
The compressor clutch assembly consists of a sta-
tionary electromagnetic coil, a pulley bearing and
pulley assembly, and a clutch plate (Fig. 1). The elec-
tromagnetic coil and the pulley bearing and pulley
assembly are each retained on the nose of the com-
pressor front housing with snap rings. The clutch
plate is keyed to the compressor shaft and secured
with a nut. These components provide the means toengage and disengage the compressor from the
engine serpentine accessory drive belt.
OPERATION
The A/C compressor clutch provides the means to
engage and disengage the A/C compressor from the
engine serpentine accessory drive belt. When the
clutch coil is energized, it magnetically draws the
clutch into contact with the pulley and drives the
compressor shaft. When the coil is not energized, the
pulley freewheels on the pulley bearing, which is
part of the pulley assembly. The compressor clutch
DRCONTROLS 24 - 9