engine DODGE RAM 1999 Service Owner's Manual
[x] Cancel search | Manufacturer: DODGE, Model Year: 1999, Model line: RAM, Model: DODGE RAM 1999Pages: 1691, PDF Size: 40.34 MB
Page 95 of 1691
knob pointer) is flush with base of A/C-heater control panel.
5) Rotate temperature control knob to its full clockwise
stop. Release knob. Knob pointer should be aimed at end of Red stripe.
If knob is pointed at end of Red stripe, go to next step. If knob is
not pointed at end of Red stripe, go back to step 2) and repeat
adjustment procedure.
6) Rotate temperature control knob to its full
counterclockwise stop. Release knob. If knob springs back, self-
adjuster clip securing temperature control cable to blend-air door
lever is improperly installed. See TEMPERATURE CONTROL CABLE R & I. If
knob does not spring back, temperature control cable adjustment is
complete.
TESTING
* PLEASE READ THIS FIRST *
WARNING: To avoid injury from accidental air bag deployment, read and
carefully follow all SERVICE PRECAUTIONS and DISABLING &
ACTIVATING AIR BAG SYSTEM procedures in AIR BAG SYSTEM SAFETY
article.
A/C-HEATER CONTROL PANEL TEST
1) Connect a vacuum gauge in line with Black A/C-heater
vacuum supply hose, located at tee near power brake booster (Dakota)
or in engine compartment (Durango and Ram Pickup). Position gauge so
it can be viewed from passenger compartment.
2) Start engine. While observing gauge, rotate mode control
knob to each mode position (one position at a time). Pause after each
selection. Test gauge should drop, then return to 8 in. Hg shortly
after each selection is made. If gauge reading is as specified, go to
next step. If gauge reading is not as specified, check for vacuum leak
in vacuum lines or A/C-heater control panel.
3) Move temperature control knob quickly to full hot and full
cold positions. A distinct sound of blend-air door hitting its stops
should be heard. No spring-back of knob should exist.
4) If temperature control knob operates as specified,
temperature control system is okay. On Dakota and Durango, if
temperature control knob does not operate as specified, check
condition, routing, installation, and adjustment of temperature
control cable. See TEMPERATURE CONTROL CABLE ADJUSTMENT . Also check
blend air door for proper installation, obstructions, or faulty seals.
A/C SYSTEM PERFORMANCE
1) Park vehicle out of direct sunlight. Ensure ambient
temperature is at least 70F (21C). Connect tachometer and manifold
gauge set to vehicle. Turn A/C on. Turn mode control to panel and
recirculated air positions, temperature control lever to maximum
cooling, and blower to high.
2) Start engine and allow it to run at 1000 RPM, with A/C
compressor clutch engaged. Engine should be at operating temperature
with doors, windows, and hood closed. Insert thermometer into left
center air outlet.
3) Run engine and operate system for 5 minutes. The A/C
compressor clutch may cycle, depending on temperature. If A/C
compressor clutch cycles, stop engine and disconnect negative battery
cable. Remove clutch cycling pressure switch connector. Place a jumper
wire across terminals of clutch cycling pressure switch harness
connector.
4) Connect negative battery cable. Turn A/C on. Start and
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operate engine at idle speed. With A/C compressor clutch engaged, note
air outlet temperature, compressor discharge pressure, and evaporator
inlet pressure. See appropriate A/C SYSTEM PERFORMANCE TEMPERATURE
SPECIFICATIONS and A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS
tables.
A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS (DAKOTA)
\
\
\
\
\
\
\
Ambient Temp. F (C) Outlet Vent Temp. F (C)
70 (21) ..................................................... 38 (3\
)
80 (27) ..................................................... 44 (7\
)
90 (32) ..................................................... 48 (9\
)
100 (38) ................................................... 55 (13\
)
110 (43) ................................................... 64 (18\
)
\
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\
A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS (DURANGO) \
\
\
\
\
\
\
Ambient Temp. F (C) Outlet Vent Temp. F (C)
70 (21) ..................................................... 48 (9\
)
80 (27) ..................................................... 48 (9\
)
90 (32) .................................................... 54 (12\
)
100 (38) ................................................... 59 (15\
)
110 (43) ................................................... 65 (18\
)
\
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\
\
\
\
A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS (RAM PICKUP) \
\
\
\
\
\
\
Ambient Temp. F (C) Outlet Vent Temp. F (C)
70 (21) ................................................ 40-45 (5-7\
)
80 (27) .............................................. 55-60 (13-16\
)
90 (32) .............................................. 60-70 (16-21\
)
100 (38) ............................................. 70-75 (21-24\
)
110 (43) ............................................. 80-85 (27-29\
)
120 (49) ............................................. 85-90 (29-32\
)
\
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\
A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS (DAKOTA) \
\
\
\
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\
Ambient Temp. High Side Low SideF (C) psi (kg/cm) psi (kg/cm)
70 (21) .............. 160-200 (11.2-14.1) ....... 25-35 (1.8-2\
.5)
80 (27) .............. 190-220 (13.4-15.5) ....... 32-40 (2.2-2\
.8)
90 (32) .............. 200-240 (14.1-16.9) ....... 37-45 (2.6-3\
.2)
100 (38) ............. 220-260 (15.5-18.3) ....... 39-50 (2.7-3\
.5)
110 (43) ............. 250-300 (17.6-21.1) ....... 45-55 (3.2-3\
.9)
\
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A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS (DURANGO) \
\
\
\
\
\
\
Ambient Temp. High Side Low SideF (C) psi (kg/cm) psi (kg/cm)
70 (21) .............. 100-150 (7.0-10.5) ........ 20-30 (1.4-2\
.1)
80 (27) .............. 135-185 (9.5-13.0) ........ 20-30 (1.4-2\
.1)
90 (32) .............. 170-220 (12.0-15.5) ....... 25-35 (1.8-2\
.5)
100 (38) ............. 210-255 (14.8-17.9) ....... 31-41 (2.2-2\
.9)
110 (43) ............. 245-295 (17.2-20.7) ....... 37-47 (2.6-3\
.3)
\
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Page 99 of 1691
![DODGE RAM 1999 Service Owners Manual control panel and blower motor.
Fig. 3: Identifying Blower Motor Switch Connector Terminals (Typical)\
Courtesy of Chrysler Corp.
Rear (Durango)
1) Disconnect negative battery cabl](/img/12/56915/w960_56915-98.png "DODGE RAM 1999 Service Owners Manual control panel and blower motor.
Fig. 3: Identifying Blower Motor Switch Connector Terminals (Typical)\
Courtesy of Chrysler Corp.
Rear (Durango)
1) Disconnect negative battery cabl")
control panel and blower motor.
Fig. 3: Identifying Blower Motor Switch Connector Terminals (Typical)\
Courtesy of Chrysler Corp.
Rear (Durango)
1) Disconnect negative battery cable. Remove rear blower
motor switch located in headliner. See BLOWER MOTOR SWITCH (REAR)
under REMOVAL & INSTALLATION. Disconnect rear blower motor switch
connector. Using an ohmmeter, check continuity between rear blower
motor switch connector Black wire and ground. If continuity exists, go
to next step. If continuity does not exist, repair open in Black wire
between rear blower motor switch connector and ground connector
located at left rear of vehicle body.
2) Place blower motor switch knob to any position except OFF.
Using an ohmmeter, check for continuity between rear blower motor
switch connector Black wire and Black/Light Blue wire, and
Black/Orange wire and Dark Green wire while rotating blower motor
switch.
3) If continuity does not exist at any terminal, replace
faulty blower motor switch. If continuity exists as specified, check
for open in circuits between blower motor switch and blower motor
resistor. Also check for an open in circuit between blower motor
switch connector and blower motor relay.
CLUTCH CYCLING PRESSURE SWITCH
Dakota & Ram Pickup
1) Locate clutch cycling pressure switch on side or top of
A/C accumulator. Ensure clutch cycling pressure switch is properly
installed on A/C accumulator fitting. Ensure system pressure is
correct. See A/C SYSTEM PERFORMANCE test.
2) Start and run engine with A/C on. If clutch cycles, turn
engine off and disconnect negative battery cable. Disconnect clutch
cycling pressure switch connector. Place a jumper wire across
terminals of clutch cycling pressure switch harness connector. Connect
negative battery cable. Connect manifold gauge set. Set A/C-heater
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controls to A/C. Start and operate engine at idle speed.
3) Using an ohmmeter, check for continuity between switch
terminals. Continuity should exist when suction pressure reading is
above 38 psi (2.7 kg/cm
) on Dakota; 43 psi (3.0 kg/cm) on Ram
Pickup. Continuity should not exist when suction pressure reading
drops below 20.5 psi (1.4 kg/cm
) on Dakota; 25 psi (1.8 kg/cm) on
Ram Pickup. If switch is okay, test and repair clutch control circuit
as needed. If switch is not okay, replace faulty clutch cycling
pressure switch.
ELECTRONIC CYCLING CLUTCH SWITCH
Durango
1) Locate electronic cycling clutch switch on thermal
expansion valve in engine compartment. Ensure system pressure is
correct. See A/C SYSTEM PERFORMANCE test. Ensure low pressure cut-out
switch and high pressure cut-out switch are working properly. See
LOW PRESSURE CUT-OUT SWITCH TEST and HIGH PRESSURE CUT-OUT SWITCH
test.
2) Disconnect negative battery cable. Disconnect electronic
cycling clutch switch and high pressure cut-out switch connectors.
Using an ohmmeter, check for continuity in Light Green/White wire
between electronic cycling clutch switch and high pressure cut-out
switch. If continuity exists in Light Green/White wire, go to next
step. If continuity does not exist in Light Green/White wire, repair
wire as necessary.
3) Disconnect low pressure cut-out switch connector. Using an
ohmmeter, check for continuity in Dark Blue/Yellow wire between
electronic cycling clutch switch and low pressure cut-out switch. If
continuity exists in Dark Blue/Yellow wire, go to next step. If
continuity does not exist in Dark Blue/Yellow wire, repair wire as
necessary.
4) Connect low pressure cut-out switch and high pressure cut-
out switch connectors. Connect negative battery cable. Turn ignition
on. Using voltmeter, check for battery voltage at electronic cycling
clutch switch connector terminal No. 2 (White wire). If battery
voltage exists, go to step 6).
5) If battery voltage does not exist, check fuse No. 7 (15-
amp) at junction block located at bottom left of instrument panel. If
fuse is okay, check for short or open in White wire between electronic
cycling clutch switch connector and fuse No. 7 (15-amp) at junction
block.
6) Connect electronic cycling clutch switch connector. Ensure
ambient temperature is between 68-90
F (20-30C). Start engine and
turn A/C on. If compressor clutch cycles 2-3 times per minute, replace
faulty electronic cycling clutch switch. If compressor clutch does not
cycle, check PCM for proper operation. See appropriate G - TESTS
W/CODES article in ENGINE PERFORMANCE section.
HIGH PRESSURE CUT-OUT SWITCH
1) Locate high pressure cut-out switch on compressor
discharge line, near compressor. Ensure system pressure is correct.
See A/C SYSTEM PERFORMANCE test. Disconnect negative battery cable.
Disconnect high pressure cut-off switch connector.
2) Using an ohmmeter, check for continuity between switch
terminals. If continuity exists, test and repair clutch control
circuit as needed. If continuity does not exist, replace faulty
switch.
LOW PRESSURE CUT-OUT SWITCH TEST
Durango
Page 101 of 1691
1) Locate low pressure cut-out switch located on suction
line, near firewall. Ensure system pressure is correct. See
A/C SYSTEM PERFORMANCE test. Disconnect negative battery cable.
Disconnect low pressure cut-out switch connector.
2) Place a jumper wire across terminals of low pressure cut-
out switch harness connector. Connect negative battery cable. Connect
manifold gauge set. Set A/C-heater controls to A/C. Start and operate
engine at idle speed.
3) Using an ohmmeter, check for continuity between switch
terminals. Continuity should exist when suction pressure reading is
between 13-27 psi (.9-1.9 kg/cm
). Continuity should not exist when
suction pressure reading is 10 psi (.7 kg/cm) or lower. If switch is
okay, repair open or short in Brown wire between low pressure cut-out
switch and PCM. If switch is not okay, replace faulty low pressure
cut-out switch.
REMOVAL & INSTALLATION
* PLEASE READ THIS FIRST *
WARNING: To avoid injury from accidental air bag deployment, read and
carefully follow all SERVICE PRECAUTIONS and DISABLING &
ACTIVATING AIR BAG SYSTEM procedures in AIR BAG SYSTEM SAFETY
article.
A/C-HEATER ASSEMBLY
Removal (Dakota & Durango - Front)
1) Disconnect negative battery cable. Drain cooling system.
Discharge A/C system, using approved refrigerant recovery/recycling
equipment. Disconnect refrigerant lines from evaporator and plug or
cover all openings in A/C system. Remove instrument panel. See
INSTRUMENT PANEL .
2) In engine compartment, disconnect heater hoses. Remove 4
A/C-heater assembly nuts from engine compartment firewall. Inside
vehicle, remove A/C-heater assembly support brace screw, and swing
support brace out of way. Move passenger seat rearward.
3) Carefully pull A/C-heater assembly rearward until studs
and heater core tubes clear firewall. Lower A/C-heater assembly and
rotate assembly until studs are facing downward. Remove A/C-heater
assembly from vehicle. See Fig. 4.
4) Place A/C-heater assembly on work bench with assembly
housing cover facing down. Remove 2 screws securing A/C-heater
assembly housing cover to blower motor housing cover. Unplug vacuum
harness connector from panel/defrost door actuator.
5) Remove floor duct from A/C-heater assembly housing. Remove
2 screws securing A/C-heater assembly housing cover to lower housing
near floor outlet. Turn assembly over. Disengage vacuum harness
retainer and vacuum harness. Remove 13 screws securing housing cover.
6) Remove blend-air door lever. Gently pry panel-defrost door
lever off. Pull up on A/C-heater assembly housing cover far enough to
separate cover sealant and remove cover.
Installation
Ensure blower motor housing cover sealant is in place and in
good condition. To complete installation, reverse removal procedure.
Page 104 of 1691
assembly towards right side of vehicle and remove rear A/C-heater
assembly.
5) To install, reverse removal procedure. Ensure all wiring
and hoses are clear and not pinched. Tighten bolts and nuts to
specification. See TORQUE SPECIFICATIONS .
Removal (Ram Pickup - Front)
1) Disconnect negative battery cable. Drain cooling system.
In engine compartment, remove coolant hoses from heater core tubes.
Remove coolant overflow bottle.
2) Discharge A/C system, using approved refrigerant
recovery/recycling equipment. Disconnect refrigerant lines from
evaporator and plug or cover all openings in A/C system. Remove
instrument panel. See INSTRUMENT PANEL. Remove Powertrain Control
Module (PCM) and position aside. DO NOT disconnect 60-pin connector
from PCM.
3) Remove attaching nuts from studs on engine compartment
side of dash panel. Remove defrost duct. Disconnect electrical
connectors. Remove attaching nuts from studs in passenger compartment
side of dash panel. Remove A/C-heater assembly from vehicle. See
Fig. 5 .
4) Place A/C-heater assembly upside-down on work bench.
Remove screw securing floor duct to bottom of A/C-heater assembly and
slide floor duct off of center heat duct adapter. Unsnap center heat
duct adapter from bottom of A/C-heater assembly housing. Remove screw
hidden behind adapter. Remove remaining screws and separate A/C-heater
assembly.
Installation
Ensure mode door pivot pins are properly inserted in holes.
To complete installation, reverse removal procedure.
A/C-HEATER CONTROL PANEL R & I
Removal & Installation (Dakota & Durango)
1) Disconnect negative battery cable. On models equipped with
A/T, unlock ignition switch. Set parking brake and place gear selector
lever in "L" position. If equipped, set tilt steering column in lowest
position.
2) On all models, carefully pry bezel away from instrument
panel to disengage clips. Unplug connectors from cigarette lighter and
auxiliary power outlet. Disconnect fog light switch (if equipped).
Remove A/C-heater control panel screws.
3) Pull control panel outward enough to disconnect wiring
connector, vacuum harness, and temperature control cable. Remove A/C-
heater control panel. To install, reverse removal procedure. Adjust
temperature control cable. See TEMPERATURE CONTROL CABLE ADJUSTMENT .
Removal & Installation (Ram Pickup)
1) Disconnect negative battery cable. Reach under driver's
side of instrument panel, near transmission tunnel and unplug A/C-
heater control panel to A/C-heater assembly vacuum harness connector.
Disconnect vacuum harness from center air duct.
2) On models equipped with A/T, unlock ignition switch. Set
parking brake and place gear selector lever in "L" position. If
equipped, set tilt steering column in lowest position.
3) On all models, remove screw securing cluster bezel to
instrument panel. See Fig. 6. Carefully pry bezel away from instrument
panel to disengage clips. Unplug connectors from cigarette lighter and
auxiliary power outlet.
4) Remove 4 screws attaching A/C-heater control panel. Pull
control panel outward enough to disconnect wiring connector, vacuum
harness and temperature control cable. Remove A/C-heater control
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procedure.
NOTE: On Durango rear A/C-heater assembly, blower motor and fan are
serviced as an assembly.
Removal (Durango - Rear)
1) Disconnect negative battery cable. Remove headliner from
passenger compartment of vehicle. Remove sun visors and sun visor arm
supports.
2) Remove coat hooks, overhead assist handle and dome light.
If equipped, remove overhead console. Remove air outlet bezel from
rear A/C-assembly. Remove rear blower motor switch. Remove upper
liftgate opening trim. Disengage "A", "B", "C", and "D" pillar trim as
necessary to prevent trim panel interference.
3) Move second and third row seats to cargo position. Move
front seats to full recline position. Remove headliner fasteners.
Carefully bow headliner and remove through lift gate opening.
4) Disconnect "B" pillar drain hoses from "Y" fittings.
Remove lower A/C-heater assembly cover. Disconnect blower motor
harness connector. Remove blower motor and fan assembly. To install,
reverse removal procedure.
Removal (Ram Pickup - Front)
1) Disconnect negative battery cable. Disconnect blower motor
cooling tube. Remove blower motor electrical connector from retainer.
Disconnect electrical connector. See Fig. 5.
2) Remove blower motor and fan assembly mounting screws.
Remove blower motor and fan assembly. Place reference marks on blower
motor and fan for reassembly reference. Remove blower motor fan
retainer clip. Pull blower motor fan off blower motor shaft.
Installation
Align reference marks made during removal. Press blower fan
hub onto blower motor shaft. Ensure retainer clip ears are indexed
over flats of blower motor shaft and fan hub. Ensure blower motor seal
is installed on housing. To complete installation, reverse removal
procedure.
BLOWER MOTOR RESISTOR
Removal & Installation (Dakota & Durango - Front)
Blower motor resistor is located in engine compartment, under
upper right corner of dash panel. Disconnect negative battery cable.
Remove cowl plenum cover to access resistor. Remove blower motor
resistor connector. Remove resistor retaining screws. Remove blower
motor resistor. To install, reverse removal procedure.
Removal & Installation (Durango - Rear)
1) Rear blower motor resistor is located in A/C-heater
assembly. Disconnect negative battery cable. Remove headliner from
passenger compartment of vehicle. Remove sun visors and sun visor arm
supports.
2) Remove coat hooks, overhead assist handle and dome light.
If equipped, remove overhead console. Remove air outlet bezel from
rear A/C-assembly. Remove rear blower motor switch. Remove upper
liftgate opening trim. Disengage "A", "B", "C", and "D" pillar trim as
necessary to prevent trim panel interference.
3) Move second and third row seats to cargo position. Move
front seats to full recline position. Remove headliner fasteners.
Carefully bow headliner and remove through lift gate opening.
4) Disconnect "B" pillar drain hoses from "Y" fittings.
Remove lower A/C-heater assembly cover. Disconnect rear blower motor
resistor connector. Remove screw and rear blower motor resistor. To
Page 107 of 1691
install, reverse removal procedure.
Removal & Installation (Ram Pickup - Front)
Blower motor resistor is located under glove box, attached to
blower motor housing. See Fig. 5. Disconnect negative battery cable.
Remove blower motor resistor connector. Remove resistor retaining
screws. Remove blower motor resistor. To install, reverse removal
procedure.
BLOWER MOTOR SWITCH (REAR)
Removal & Installation (Durango)
Disconnect negative battery cable. Pry above indentations at
outer perimeter of rear blower motor switch. Pull rear blower motor
switch and disconnect electrical connector. Remove rear blower motor
switch. To install, reverse removal procedure.
COMPRESSOR
Removal & Installation
1) Disconnect negative battery cable. Discharge A/C system,
using approved refrigerant recovery/recycling equipment. Disconnect
refrigerant lines and plug or cover all openings in A/C system.
2) Remove drive belt. Disconnect compressor electrical leads.
Remove compressor mounting nuts and bolts. Remove compressor. Drain
oil from compressor, and record amount of oil drained.
3) To install, reverse removal procedure. Using new
refrigerant oil, add to compressor the same amount of oil drained from
it. Evacuate and charge A/C system.
CONDENSER
NOTE: Before removing condenser, note location of radiator and
condenser air seals. If air seals are not installed properly,
A/C and engine cooling systems will not perform properly.
Removal
1) Disconnect negative battery cable. Discharge A/C system,
using approved refrigerant recovery/recycling equipment. Disconnect
A/C fittings at inlet and outlet of condenser. Plug or cover all
openings in A/C system.
2) On Dakota, remove bolts securing radiator and fan shroud
to inside of upper radiator crossmember. Remove top mounting bolts
securing condenser to upper crossmember. Tilt top of radiator and fan
shroud toward engine.
3) On Ram Pickup (gasoline engine), remove bolts securing
condenser upper mounting brackets to outside of upper radiator
crossmember. Tilt condenser away from engine compartment far enough to
grasp top of condenser with both hands. On Ram Pickup (diesel engine),\
remove bolts securing condenser to charge air cooler. On all models,
lift condenser assembly from vehicle.
Installation
To install, reverse removal procedure. Install new "O" rings
to fittings. Fill cooling system. Evacuate and charge A/C system.
EVAPORATOR CORE & HEATER CORE
Removal & Installation (Dakota & Durango - Front)
Remove instrument panel. See INSTRUMENT PANEL. Remove A/C-
heater assembly. See A/C-HEATER ASSEMBLY. With A/C-heater housing
removed, remove housing cover. Remove evaporator core or heater core
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from housing. To install, reverse removal procedure. Install new "O"
rings to A/C fittings. Evacuate and charge A/C system.
Removal & Installation (Durango - Rear Evaporator Core)
1) Disconnect negative battery cable. Discharge A/C system,
using approved refrigerant recovery/recycling equipment. Remove
headliner from passenger compartment of vehicle. Remove sun visors and
sun visor arm supports.
2) Remove coat hooks, overhead assist handle and dome light.
If equipped, remove overhead console. Remove air outlet bezel from
rear A/C-heater assembly. Remove rear blower motor switch. Remove
upper liftgate opening trim. Disengage "A", "B", "C", and "D" pillar
trim as necessary to prevent trim panel interference.
3) Move second and third row seats to cargo position. Move
front seats to full recline position. Remove headliner fasteners.
Carefully bow headliner and remove through lift gate opening.
4) Disconnect "B" pillar drain hoses from "Y" fittings.
Disconnect "B" pillar refrigerant lines and plug or cover all openings
in A/C system. Remove lower A/C-heater assembly cover. Remove screws
securing refrigerant tube and retaining strap to right side of upper
housing cover. Remove evaporator core. To install, reverse removal
procedure. Install new "O" rings to A/C fittings. Evacuate and charge
A/C system.
Removal & Installation (Ram Pickup - Front)
1) Remove and disassemble A/C-heater housing. See
A/C-HEATER ASSEMBLY . Separate halves of A/C-heater housing and remove
top half. Remove evaporator or heater core from housing.
2) To install, reverse removal procedure. Install new "O"
rings to A/C fittings. Evacuate and charge A/C system. Fill cooling
system. On 5.9L diesel engine, engine is equipped with a one-way check
valve. DO NOT run engine while filling cooling system. Fill engine
with engine turned off.
INSTRUMENT PANEL
Removal & Installation (Dakota & Durango)
1) Disconnect negative battery cable. Disable air bag system.
See AIR BAG SYSTEM SAFETY article. Place front wheels in straight-
ahead position. Remove sill trim from both doorways. Remove kick panel
covers from both sides of vehicle. Remove mounting screws for hood
release handle.
2) Remove steering column trim panel and support bracket.
Remove tilt steering column lever (if equipped). Remove upper and
lower shrouds from steering column. Unplug driver's side air bag
module. Loosen multifunction switch wiring harness connector screw and
disconnect from switch. Screw will remain in connector.
3) Disconnect PRNDL cable. Disconnect shift cable from
steering column. Remove steering coupler lock pin. Remove toe plate
retaining screws. Remove steering column mounting bolts and remove
steering column from vehicle.
4) Remove screw from bulkhead wiring harness connector and
disconnect. Disconnect 2 body wiring harness connectors located next
to bulkhead connector. Disconnect 3 wiring harness connectors, from
junction block, located nearest to dash panel. Disconnect brake light
switch connector. Disconnect Rear Wheel Anti-Lock (RWAL) brake module
(if equipped), located near steering column support brackets.
5) Disconnect plastic retainer clip from parking brake
linkage rod, located at back of parking brake release handle. Remove
rod end from parking brake handle. Remove instrument panel center
support bracket. Unplug vacuum harness connector located at left end
of A/C-heater housing. Disconnect Air Bag Control Module (ACM)
connector.
Page 119 of 1691
HIGH
Some possible causes of low side system pressure being high-
to-normal and high side system pressure being too high include:
* Condenser air flow restricted.
* Inoperative cooling fan.
* Faulty expansion valve.
* Refrigerant system overcharged.
* Air in refrigerant system.
* Engine overheating.
LOW SIDE PRESSURE IS HIGH & HIGH SIDE PRESSURE IS LOW
Some possible causes of low side system pressure being too
high and high side system pressure being too low include:
* Compressor belt is slipping.
* Fixed orifice tube not installed.
* Faulty compressor.
LOW SIDE PRESSURE IS LOW & HIGH SIDE PRESSURE IS HIGH
Some possible causes of low side system pressure being too
low and high side system pressure being too high include:
* Restricted refrigerant flow through refrigerant lines.
* Restricted refrigerant flow through expansion valve.
* Restricted refrigerant flow through fixed orifice tube.
* Restricted refrigerant flow through receiver-drier.
* Restricted refrigerant flow through condenser.
BLOWER MOTOR DIAGNOSIS
BLOWER MOTOR INOPERATIVE
Some possible causes of an inoperative blower motor include:
* Faulty fuse.
* Faulty blower motor feed circuit wire harness or
connectors.
* Faulty blower motor ground circuit wire harness or
connector.
* Faulty blower motor resistor.
* Faulty blower motor relay.
* Faulty blower motor switch.
* Faulty A/C-heater mode control switch.
* Faulty blower motor.
BLOWER NOT OPERATING IN ALL SPEEDS
Possible causes of the blower not operating in all speeds
include:
* Faulty fuse.
* Faulty blower motor feed circuit wire harness or
connectors.
* Faulty blower motor relay.
* Faulty blower motor resistor.
* Faulty blower motor switch.