Dodge Dakota (ND). Manual — part 1293
1. Position the recirculation-air door (5) into the air
inlet housing (1).
CAUTION: Make sure that the recirculation-air
door pivot shaft is properly seated in the pivot
holes located in the two halves of the air inlet
housing.
NOTE: If the seal on the air door is deformed or
damaged, the air door must be replaced.
2. Install the four screws (4) that secure the two
halves of the air inlet housing together. Tighten the
screws to 2 N·m (17 in. lbs.).
3. Install the blower motor resistor onto the air inlet
housing (Refer to 24 - HEATING & AIR CONDI-
TIONING/CONTROLS/RESISTOR-BLOWER
MOTOR - INSTALLATION).
4. Install the recirculation door actuator onto the air inlet housing (Refer to 24 - HEATING & AIR CONDITIONING/
CONTROLS/ACTUATOR-RECIRCULATION DOOR - INSTALLATION).
5. Install the air inlet housing onto the HVAC housing (Refer to 24 - HEATING & AIR CONDITIONING/DISTRIBU-
TION/HOUSING-HVAC - HOUSING-AIR INLET - INSTALLATION).
INSTALLATION
HVAC HOUSING
NOTE: The HVAC housing must be removed from the vehicle and disassembled for service of the heater
core, A/C evaporator, mode-air and blend-air doors.
1. If removed, install the fresh air screen (3) onto the
dash panel (4).
2. Position the HVAC housing (2) into the passenger
compartment with the mounting studs and the con-
densate drain tube in their proper locations in the
dash panel.
3. Loosely install the three nuts (1) that secure the
HVAC housing to the engine compartment side of
the dash panel.
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4. Loosely install the two bolts (1) that secure the
HVAC housing to the passenger compartment side
of the dash panel.
5. Tighten the three nuts that secure the HVAC hous-
ing to the engine compartment side of the dash
panel to 7 N·m (62 in. lbs.).
6. Tighten the two bolts that secure the HVAC hous-
ing to the passenger compartment side of the dash
panel to 3 N·m (26 in. lbs.).
7. Install the instrument panel (Refer to 23 - BODY/
INSTRUMENT PANEL ASSEMBLY - INSTALLA-
TION).
8. Remove the previously installed plugs or caps and
connect the heater hoses to the heater core tubes.
9. Remove the previously installed plugs or caps and
connect the A/C liquid line and the A/C accumulator
to the A/C evaporator (Refer to 24 - HEATING &
AIR CONDITIONING/PLUMBING /LINE-A/C LIQ-
UID - INSTALLATION) and (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING/ACCUMULATOR-A/C -
INSTALLATION).
10. Reconnect the negative battery cable.
11. If the heater core is being replaced, flush the cooling system (Refer to 7 - COOLING - STANDARD PROCE-
DURE - COOLING SYSTEM CLEANING/REVERSE FLUSHING).
12. Refill the engine cooling system (Refer to 7 - COOLING - STANDARD PROCEDURE - COOLING SYSTEM
REFILL).
13. Evacuate the refrigerant system (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - STANDARD
PROCEDURE - REFRIGERANT SYSTEM EVACUATE).
14. Charge the refrigerant system (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - STANDARD PRO-
CEDURE - REFRIGERANT SYSTEM CHARGE).
AIR INLET HOUSING
NOTE: The air inlet housing must be removed from HVAC housing and disassembled for service of the
recirculation-air door.
1. Position the air inlet housing (2) onto the top of the
HVAC housing (6).
2. Install the four screws (4) that secure the air inlet
housing to the top of the HVAC housing. Tighten
the screws to 2 N·m (17 in. lbs.).
3. Connect the HVAC wire harness (5) to the blower
motor resistor (3) and the recirculation door actua-
tor (1).
NOTE: If the foam seal on the air inlet housing is
deformed or damaged, the seal must be replaced.
4. Install the HVAC housing (Refer to 24 - HEATING
& AIR CONDITIONING/DISTRIBUTION/HOUSING-
HVAC - INSTALLATION).
5. Reconnect the negative battery cable.
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MOTOR-BLOWER
DESCRIPTION
The blower motor (1) is a 12-volt, direct current (DC)
motor mounted within a plastic housing with an inte-
gral wire harness connector (2) and squirrel cage-type
blower wheel (3) that is secured to the blower motor
shaft (4). The blower motor wheel is located in the air
inlet housing at the passenger side end of the HVAC
housing.
The blower motor can be accessed for service from
underneath the instrument panel.
OPERATION
The blower motor is used to control the velocity of air moving through the HVAC housing by spinning the blower
wheel within the housing at the selected speed whenever the ignition switch is in the On position and the blower
control switch is in any position except Off.
Blower motor speed is controlled by regulating the path to ground through the blower motor control switch and the
blower motor resistor. The blower motor receives battery current whenever the blower motor relay is energized. The
blower motor relay output circuit is protected by a fuse in the integrated power module (IPM) located in the engine
compartment.
The blower motor and blower motor wheel are factory balanced and cannot be adjusted or repaired. If faulty or
damaged, the blower motor and blower wheel must be replaced as an assembly.
DIAGNOSIS AND TESTING
BLOWER MOTOR
WARNING: On vehicles equipped with airbags, disable the airbag system before attempting any steering
wheel, steering column, or instrument panel component diagnosis or service. 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. Failure to take the proper precautions could result in accidental
airbag deployment and possible personal injury or death.
NOTE: For circuit descriptions and diagrams, refer to Air Conditioning/Heater in Group 8W - Wiring Dia-
grams.
OPERATION
Possible causes of an inoperative blower motor include:
•
Faulty fuse
•
Faulty blower motor resistor
•
Faulty blower motor switch
•
Faulty blower motor relay
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•
Faulty blower motor
•
Faulty mode control switch
•
Faulty blower motor circuit wiring or wire harness connectors
VIBRATION
Possible causes of a blower motor vibration include:
•
Improper blower motor mounting
•
Improper blower wheel mounting
•
Deformed blower wheel
•
Out of balance blower wheel due to foreign material in the wheel
•
Faulty blower motor
NOISE
To determine if the blower motor is the source of the noise, simply switch the blower motor from Off to On. To verify
that the blower motor is the source of the noise, unplug the blower motor wire harness connector and operate the
heater-A/C system. If the noise goes away, possible causes include:
•
Foreign material in the HVAC housing
•
Improper blower motor mounting
•
Improper blower wheel mounting
•
Faulty blower motor
REMOVAL
WARNING: On vehicles equipped with airbags, disable the airbag system before attempting any steering
wheel, steering column, or instrument panel component diagnosis or service. 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 or
death.
1. Disconnect and isolate the negative battery cable.
2. Disconnect the wire harness connector (1) from the
blower motor (2).
3. Remove the three screws (3) that secure the
blower motor to the HVAC housing (4).
4. Remove the blower motor from the HVAC housing.
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