1998 DODGE RAM 1500 Over drive

INSTRUMENT PANEL DRIVER
SIDE BEZEL
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) Using a trim stick C-4755 or equivalent, at
notch in the bottom, remove the drivers side endcap.
(2) Remove the drivers side cowl trim panel. (Refer
to 23 - BODY/INTERIOR/COWL TRIM - REMOVAL)
(3) Remove the two screws. (Fig. 19)
(4) Using a trim stick C-4755 or equivalent,
release the top clips and tilt the bezel down.
(5) Disconnect the adjustable pedal switch electri-
cal connector, if equipped.
(6) Lower the bezel down fully and remove from
the lower hooks.
INSTALLATION
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) Position the bezel onto the lower hooks and lift
up.
(2) Connect the adjustable pedal switch electrical
connector, if equipped.
(3) Seat the upper attachment clips fully.
(4) Install the two screws.
(5) Position the endcap and seat fully.
(6) Install the drivers side cowl trim panel. (Refer
to 23 - BODY/INTERIOR/COWL TRIM - INSTALLA-
TION)
INSTRUMENT PANEL TOP
COVER
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) Using a trim stick C-4755 or equivalent, pry up
on the rear of the top cover and release the attach-
ment clips.
(2) Pull the top cover backwards to release the
remaining clips and remove the cover.
Fig. 19 LOWER DRIVERS SIDE BEZEL
1 - SCREWS (2)
2 - ADJUSTABLE PEDAL SWITCH (if equipped)
3 - PEDAL SWITCH ELECTRICAL CONNECTOR
4 - BEZEL
23 - 58 INSTRUMENT PANELDR

SEATS
TABLE OF CONTENTS
page page
CENTER SEAT
REMOVAL.............................75
INSTALLATION.........................76
CENTER ARMREST / SEAT BACK
REMOVAL.............................76
INSTALLATION.........................77
CENTER SEAT BACK INERTIA HINGE COVER
REMOVAL.............................77
INSTALLATION.........................77
CENTER SEAT BACK HINGE
REMOVAL.............................78
INSTALLATION.........................79
CENTER SEAT BACK LID
REMOVAL.............................79
INSTALLATION.........................79
CENTER SEAT CUSHION
REMOVAL.............................79
INSTALLATION.........................79
CENTER SEAT CUSHION COVER
REMOVAL.............................79
INSTALLATION.........................79
UNDER SEAT STORAGE BIN LID
REMOVAL.............................80
INSTALLATION.........................80
UNDER SEAT STORAGE BIN
REMOVAL.............................80
INSTALLATION.........................80
UNDER SEAT STORAGE BIN COVERING
REMOVAL.............................80
INSTALLATION.........................80
UNDER SEAT STORAGE BIN LATCH
REMOVAL.............................80
INSTALLATION.........................80
HEADREST
REMOVAL.............................80
INSTALLATION.........................80
HEADREST SLEEVE
REMOVAL.............................81INSTALLATION.........................81
SEAT - FRONT
REMOVAL.............................81
INSTALLATION.........................81
LUMBAR SUPPORT HANDLE/BEZEL
REMOVAL.............................82
INSTALLATION.........................82
SEAT BACK CUSHION / COVER - FRONT
REMOVAL.............................82
INSTALLATION.........................82
SEAT CUSHION / COVER - FRONT
REMOVAL.............................83
INSTALLATION.........................83
SEAT TRACK
REMOVAL.............................83
INSTALLATION.........................83
SEAT - REAR
REMOVAL.............................83
INSTALLATION.........................83
SEAT BACK - REAR
REMOVAL.............................83
INSTALLATION.........................83
SEAT BACK CUSHION / COVER - REAR
REMOVAL.............................84
INSTALLATION.........................84
SEAT CUSHION / COVER - REAR
REMOVAL.............................84
INSTALLATION.........................84
SEAT CUSHION FRAME - REAR
REMOVAL.............................85
INSTALLATION.........................85
SEAT BACK REAR - FOOTMANS LOOP
BRACKETS
REMOVAL.............................85
INSTALLATION.........................85
CENTER SEAT
REMOVAL
NOTE: Do not reuse the seat fasteners, always
replace with new ones.
(1) Remove and discard the front bolts. (Fig. 1)(2) Position the seats forward, remove the rear
bolts and discard.
(3) Disconnect the 12v power supply electrical con-
nector, if equipped. (Fig. 2)
(4) Fold the seat backs forward and roll the seat
assembly back in the vehicle.
(5) Remove the nuts attaching the center seat to
the drivers seat and the passenger seat and discard.
(Fig. 3)
DRSEATS 23 - 75

(6) Roll the seat assembly forward and remove the
center seat portion.
INSTALLATION
NOTE: Do not reuse the seat fasteners, always
replace with new ones.(1) Install the center seat and roll the seat assem-
bly back in the vehicle.
(2) Install new nuts attaching the center seat to
the drivers and passenger seat.
(3) Tighten the nuts to 25 N´m (18 ft. lbs.).
(4) Roll the seat assembly forward and install new
rear bolts.
(5) Connect the 12v power supply electrical con-
nector, if equipped.
(6) Tighten the rear bolts to 40 N´m (30 ft. lbs.).
(7) Fold the seat backs up and slide the seats to
the rear.
(8) Install new front bolts and tighten to 28 N´m
(21 ft. lbs.).
CENTER ARMREST / SEAT
BACK
REMOVAL
NOTE: Do not reuse the seat fasteners, always
replace with new ones.
(1) Remove the center seat. (Refer to 23 - BODY/
SEATS/SEAT - CENTER - REMOVAL)
(2) Disconnect the storage bin/cushion cover
j-straps and position aside.
(3) Remove and discard the hinge bolts and sepa-
rate the seat back from the storage bin/cushion. (Fig.
4)
Fig. 1 FRONT SEAT ASSEMBLY
1 - FRONT SEAT ASSEMBLY
2 - REAR BOLTS (4)
3 - ELECTRICAL CONNECTOR
4 - FRONT BOLTS (4)
Fig. 2 CENTER SEAT ATTACHMENTS
1 - CENTER SEAT ASSEMBLY
2 - FRONT NUTS (2)
3 - POWER SUPPLY ELECTRICAL CONNECTOR
4 - REAR NUTS (4)
5 - 12V POWER SUPPLY HARNESS
Fig. 3 REAR ATTACHMENTS
1 - 12V POWER SUPPLY HARNESS
2 - CENTER SEAT STORAGE BIN
3 - FRONT SEAT TRACKS
4 - REAR NUTS (4)
23 - 76 SEATSDR
CENTER SEAT (Continued)

(2) Install the three nuts attaching the center seat
section to the other seat, and tighten to 25 N´m (18
ft. lbs.).
(3) Roll the seat assembly forward and install new
rear bolts.
(4) Connect the 12v power supply electrical con-
nector.
(5) Tighten the rear bolts to 40 N´m (30 ft. lbs.).
(6) Fold the seat backs up and slide the seats to
the rear.
(7) Install new front bolts and tighten to 28 N´m
(21 ft. lbs.).
LUMBAR SUPPORT HANDLE/
BEZEL
REMOVAL
CAUTION: Care must be taken not to damage the
handle or bezel surface when removing.
(1) Using a trim stick C-4755 or equivalent, pry
the manual lumbar knob out of the bezel surround.
(Fig. 15)
(2) Remove the bezel retaining screws and remove
the bezel. (Fig. 16)
INSTALLATION
(1) Align the bezel to the seat back and install the
screws.
(2) Snap the manual lumbar knob onto the shaft of
the drive mechanism into the bezel surround.
SEAT BACK CUSHION / COVER
- FRONT
REMOVAL
(1) Remove the front seat. (Refer to 23 - BODY/
SEATS/SEAT - FRONT - REMOVAL)
(2) Remove the lumbar handle and bezel, if
equipped. (Refer to 23 - BODY/SEATS/LUMBAR
SUPPORT HANDLE/BEZEL - REMOVAL)
(3) Remove the headrest sleeves. (Refer to 23 -
BODY/SEATS/HEADREST SLEEVE - REMOVAL)
(4) Unzip the zip strip at the lower end of the seat
back and remove the seat back cover and cushion.
INSTALLATION
(1) Install the seat back cushion and cover onto
the seat frame assembly.
(2) Connect the zip strip at the bottom of the seat
back.
(3) Install the headrest sleeves. (Refer to 23 -
BODY/SEATS/HEADREST SLEEVE - INSTALLA-
TION)
(4) Install the lumbar bezel and handle, if
equipped. (Refer to 23 - BODY/SEATS/LUMBAR
SUPPORT HANDLE/BEZEL - INSTALLATION)
(5) Install the seat. (Refer to 23 - BODY/SEATS/
SEAT - FRONT - INSTALLATION)
Fig. 15 MANUAL LUMBAR KNOB
Fig. 16 MANUAL LUMBAR BEZEL
1 - LUMBAR SHAFT
2 - SCREWS
3 - BEZEL
23 - 82 SEATSDR
SEAT - FRONT (Continued)

ber above the heating, ventilation and air condition-
ing (HVAC) housing. On models equipped with air
conditioning, the air passes through the evaporator
coil. Air flow can be directed either through or
around the heater core. This is done by adjusting the
blend door with the temperature control knob on the
A/C-heater control located the instrument panel. The
air flow can then be directed from the panel, floor
and defrost outlets in various combinations using the
mode control knob located on the A/C-heater control.
Air flow velocity can be adjusted with the blower
speed selector located on the A/C-heater control.
NOTE: It is important to keep the air intake opening
clear of debris. Leaf particles and other debris that
is small enough to pass through the cowl opening
screen can accumulate within the HVAC housing.
The closed, warm, damp and dark environment cre-
ated within the housing is ideal for the growth of
certain molds, mildews and other fungi. Any accu-mulation of decaying plant matter provides an addi-
tional food source for fungal spores, which enter
the housing with the fresh intake-air. Excess debris,
as well as objectionable odors created by decaying
plant matter and growing fungi can be discharged
into the passenger compartment during heater-A/C
operation if the air intake opening is not kept clear
of debris.
The heater and air conditioning systems are blend-
air type systems. In a blend-air system, a blend door
controls the amount of unconditioned air (or cooled
air from the evaporator on models with air condition-
ing) that is allowed to flow through, or around, the
heater core. A temperature control knob determines
the discharge air temperature by actuating an elec-
tric motor, which operates the blend door. This allows
an almost immediate control of the output air tem-
perature of the system.
On all models, the outside air intake can be shut
off by selecting the Recirculation Mode with the
mode control knob. This will operate a electric actu-
ated recirculation air door that closes off the outside
fresh air intake and recirculates the air that is
already inside the vehicle.
The air conditioning compressor can be engaged in
any mode by pressing the snowflake, A/C on/off but-
ton. It can also be engaged by placing the mode con-
trol in the mix to defrost positions. This will remove
heat and humidity from the air before it is directed
through or around the heater core. The mode control
knob on the A/C-heater control is used to also direct
the conditioned air to the selected system outlets.
The mode control switch uses an electric motor to
control the mode doors.
The defroster outlet receives airflow from the
HVAC housing through the molded plastic defroster
duct, which connects to the HVAC housing defroster
outlet. The airflow from the defroster outlets is
directed by fixed vanes in the defroster outlet grilles
and cannot be adjusted. The defroster outlet grilles
are integral to the instrument panel top cover.
The side window demister outlets receive airflow
from the HVAC housing through the molded plastic
defroster duct and two molded plastic demister ducts.
The airflow from the side window demister outlets is
directed by fixed vanes in the demister outlet grilles
and cannot be adjusted. The side window demister
outlet grilles are integral to the instrument panel.
The demisters direct air from the HVAC housing
through the outlets located on the top corners of the
instrument panel. The demisters operate when the
mode control knob is positioned in the floor-defrost
and defrost-only settings. Some air may be noticeable
from the demister outlets when the mode control is
in the bi-level to floor positions.
Fig. 1 HVAC Housing - Dual Zone Shown, Single
Zone Typical
1 - NUT
2 - PASSENGER BLEND DOOR ACTUATOR
3 - NUT
4 - INLET BAFFLE
5 - RECIRCULATION DOOR ACTUATOR
6 - RECIRCULATION DOOR
7 - DRIVER SIDE BLEND DOOR ACTUATOR
8 - HVAC HOUSING
9 - BOLT
10 - DEFROSTER DOOR ACTUATOR
11 - MODE DOOR ACTUATOR
24 - 2 HEATING & AIR CONDITIONINGDR
HEATING & AIR CONDITIONING (Continued)

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)

Condition Possible Causes Correction
Normal pressures, but A/C
Performance Test air
temperatures at center panel
outlet are too high.1. Excessive refrigerant oil in
system.1. See Refrigerant Oil Level in this group.
Recover the refrigerant from the refrigerant
system and inspect the refrigerant oil content.
Restore the refrigerant oil to the proper level, if
required.
2. Blend door inoperative or
sealing improperly.2. See Blend Door in this group. Inspect the
blend door for proper operation and sealing and
correct, if required.
3. Blend door actuator faulty
or inoperative.3. Perform blend door actuator diagnosis, replace
if faulty.
The low side pressure is
normal or slightly low, and the
high side pressure is too low.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.
2. Refrigerant flow through
the accumulator is restricted.2. See Accumulator in this group. Replace the
restricted accumulator, if required.
3. Refrigerant flow through
the evaporator coil is
restricted.3. See A/C Evaporator in this group. Replace the
restricted evaporator coil, if required.
4. Faulty compressor. 4. See A/C Compressor in this group. Replace
the compressor, if required.
The low side pressure is
normal or slightly high, and
the high side pressure is too
high.1. Condenser air flow
restricted.1. Check the A/C condenser for damaged fins,
foreign objects obstructing air flow through the
condenser fins, and missing or improperly
installed air seals. Refer to Cooling for more
information on air seals. Clean, repair, or replace
components as required.
2. Inoperative cooling fan. 2. Refer to Cooling for more information. Test the
cooling fan and replace, if required.
3. Refrigerant system
overcharged.3. See Refrigerant System Charge in this group.
Recover the refrigerant from the refrigerant
system. Charge the refrigerant system to the
proper level, if required.
4. Air in the refrigerant
system.4. See Refrigerant System Leaks in this group.
Test the refrigerant system for leaks. Repair,
evacuate and charge the refrigerant system, if
required.
5. Engine overheating. 5. Refer to Cooling for more information. Test the
cooling system and repair, if required.
The low side pressure is too
high, and the high side
pressure is too low.1. Accessory drive belt
slipping.1. Refer to Cooling for more information. Inspect
the accessory drive belt condition and tension.
Tighten or replace the accessory drive belt, if
required.
2. Fixed orifice tube not
installed.2. See A/C Orifice Tube in this group. Replace
the liquid line, if required.
3. Faulty compressor. 3. See A/C Compressor in this group. Replace
the compressor, if required.
DRHEATING & AIR CONDITIONING 24 - 5
HEATING & AIR CONDITIONING (Continued)

Condition Possible Causes Correction
The low side pressure is too
low, and the high side
pressure is too high.1. Restricted refrigerant flow
through the refrigerant lines.1. See Liquid, Suction, and Discharge Line in this
group. Inspect the refrigerant lines for kinks, tight
bends or improper routing. Correct the routing or
replace the refrigerant line, if required.
2. Restricted refrigerant flow
through the fixed orifice tube.2. See A/C Orifice Tube in this group. Replace
the liquid line, if required.
3. Restricted refrigerant flow
through the condenser.3. See A/C Condenser in this group. Replace the
restricted condenser, if required.
DIAGNOSIS AND TESTING - HEATER
PERFORMANCE TEST
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).
Check the coolant level, drive belt tension, vacuum
line connections, radiator air flow and fan operation.
Start engine and allow to warm up to normal tem-
perature.
WARNING: DO NOT REMOVE RADIATOR CAP
WHEN ENGINE IS HOT, PERSONAL INJURY CAN
RESULT.
If vehicle has been run recently, wait 15 minutes
before removing cap. Place a rag over the cap andturn it to the first safety stop. Allow pressure to
escape through the overflow tube. When the system
stabilizes, remove the cap completely.
MAXIMUM HEATER OUTPUT: TEST AND ACTION
Engine coolant is provided to the heater system by
two heater hoses. With the engine idling at normal
operating temperature, set the temperature control
to maximum heat, the mode control to the floor posi-
tion, and the blower in the highest speed position.
Using a test thermometer, check the temperature of
the air being discharged from the floor outlets. Com-
pare the test thermometer reading to the Tempera-
ture Reference chart.
TEMPERATURE REFERENCE CHART
Ambient Air Temperature15.5É C
(60É F)21.1É C
(70É F)26.6É C
(80É F)32.2É C
(90É F)
Minimum Air Temperature at
Floor Outlet62.2É C
(144É F)63.8É C
(147É F)65.5É C
(150É F)67.2É C
(153É F)
Both of the heater hoses should be HOT to the
touch (coolant return hose should be slightly cooler
than the supply hose). If the coolant return hose is
much cooler than the supply hose, locate and repair
the engine coolant flow obstruction in the heater sys-
tem. If both heater hoses are cool to the touch,
inspect the engine cooling system (Refer to 7 -
COOLING - DIAGNOSIS AND TESTING).
OBSTRUCTED COOLANT FLOW Possible loca-
tions or causes of obstructed coolant flow are as fol-
lows:
²Pinched or kinked heater hoses.
²Improper heater hose routing.
²Plugged heater hoses or supply and return ports
at the cooling system connections.
²Plugged heater core.If proper coolant flow through the cooling system is
verified, and heater outlet air temperature is insuffi-
cient, a mechanical problem may exist.
MECHANICAL PROBLEMS Possible causes of
insufficient heat due to mechanical problems are as
follows:
²Obstructed cowl air intake.
²Obstructed heater system outlets.
²Blend door not functioning properly.
TEMPERATURE CONTROL
If the heater outlet air temperature cannot be
adjusted with the temperature control knob on the
A/C-heater control, the following could require ser-
vice:
²Blend door binding.
²Faulty blend door motor.
24 - 6 HEATING & AIR CONDITIONINGDR
HEATING & AIR CONDITIONING (Continued)