Chrysler 300/300 Touring/300C, Dodge Magnum. Manual - part 2345

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
HVAC air inlet housing which is mounted to the pas-
senger 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 HVAC air inlet housing at the selected speed or, in the ATC system, at the selected or programmed
speed.

On models equipped with the manual temperature control (MTC) heating-A/C system, the blower motor will operate
whenever the ignition switch is in the On position and the blower motor control in any position except Off. On mod-
els equipped with the automatic temperature control (ATC) system, the blower motor will operate whenever the igni-
tion switch is in the On position and the A/C-heater control power is turned on.

For the MTC system, blower motor speed is controlled by directing the ground path for the blower motor through the
correct resistor wire to obtain the selected speed.

For the ATC system, blower motor speed is controlled by the blower motor power module which provides the blower
motor with power and a path to ground. The blower motor power module also sends a blower control signal to the
A/C-heater control. Using input from the blower motor control (manual mode) or sensor data (automatic mode), the
A/C-heater control processes the blower control signal from the power module and sets the speed at which the
blower motor will run.

The blower motor and blower 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
negative battery (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.

24 - 414

DISTRIBUTION

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 or power module (depending on application)

•

Faulty blower motor switch

•

Faulty mode control switch

•

Faulty blower motor

•

Faulty blower motor circuit wiring or wire harness connectors

Possible causes of the blower motor not operating in all speeds include:

•

Faulty fuse

•

Faulty blower motor resistor or power module (depending on application)

•

Faulty blower motor switch

•

Faulty blower motor

•

Faulty blower motor circuit wiring or wire harness connectors

VIBRATION

Possible causes of 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 air inlet 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
negative battery (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.

DISTRIBUTION

24 - 415

NOTE: LHD model shown. RHD model similar.

1. Disconnect and isolate the negative battery cable.

2. Remove the instrument panel silencer from the

passenger side of the instrument panel (Refer to
23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL SILENCER - REMOVAL)

3. Disengage the wire harness connector locking tab

and disconnect the wire harness connector (1) and
wire harness retainers from the blower motor (2).

4. Remove the four screws (3) that secure the blower

motor to the HVAC housing (4).

5. Remove the blower motor from the HVAC housing.

INSTALLATION

NOTE: LHD model shown. RHD model similar.

1. Position the blower motor (2) into the HVAC hous-

ing (4).

2. Install the four screws (3) that secure the blower

motor to the HVAC housing. Tighten the screws to
2.2 N·m (20 in. lbs.).

3. Connect the wire harness connector (1) to the

blower motor and engage the wire harness connec-
tor locking tab.

4. Install the HVAC wire harness retainers onto the

blower motor.

5. Install the instrument panel silencer onto the pas-

senger side of the instrument panel (Refer to 23 -
BODY/INSTRUMENT

PANEL/INSTRUMENT

PANEL SILENCER - INSTALLATION)

6. Reconnect the negative battery cable.

24 - 416

DISTRIBUTION

OUTLETS-AIR

DESCRIPTION

CHRYSLER

NOTE: LHD model shown. RHD model similar.

There are two defroster air outlets (1) in the defroster
grille (2) located on the top of the instrument panel
(3). The airflow from the defroster outlets is directed
by fixed vanes in the defroster grille and cannot be
adjusted. The defroster air outlets are not serviceable
from the defroster grille (Refer to 23 - BODY/INSTRU-
MENT PANEL/DEFROSTER GRILLE - REMOVAL).

There are two side window demister air outlets (4).
One located on each end of the instrument panel top
cover. The airflow from the side window demister air
outlets is directed by fixed vanes in the outlets and
cannot be adjusted. The side window demister air out-
lets are only serviced with the outboard instrument
panel air outlets.

There are four instrument panel air outlets (5). One air
outlet is located near each outboard end of the instru-
ment panel facing the rear of the vehicle and two air
outlets are located at the top of the instrument panel center bezel. Each of the instrument panel air outlets contain
a non-serviceable grille with movable vanes (6) that are used to direct or shut off the flow of the conditioned air
leaving the instrument panel outlets. Only the outboard instrument panel air outlets can be serviced separately. For
service of the other instrument panel air outlets, refer to 23 - BODY/INSTRUMENT PANEL/INSTRUMENT PANEL
CENTER BEZEL - REMOVAL.

DODGE

NOTE: LHD model shown. RHD model similar.

There are two side window demister air outlets (4).
One located on each end of the instrument panel top
cover. The airflow from the side window demister air
outlets is directed by fixed vanes in the outlets and
cannot be adjusted. The side window demister air out-
lets are not serviceable from the instrument panel top
pad (Refer to 23 - BODY/INSTRUMENT PANEL/IN-
STRUMENT PANEL TOP PAD - REMOVAL).

There are four instrument panel air outlets (5). One air
outlet is located near each outboard end of the instru-
ment panel facing the rear of the vehicle and two air outlets are located at the top of the instrument panel center
bezel. Each of the instrument panel air outlets contain a replaceable grille with movable vanes (6) that are used to
direct or shut off the flow of the conditioned air leaving the instrument panel outlets. Only the passenger side out-
board instrument panel air outlet can be serviced separately. For service of the other instrument panel air outlets,

DISTRIBUTION

24 - 417

Content .. 2343 2344 2345 2346 ..