Dodge Nitro. Manual — part 741

Fig. 42: Removing/Installing Four Screws That Secure A/C-Heater Control To Instrument Panel Center
Bezel
Courtesy of CHRYSLER LLC

1. Disconnect and isolate the negative battery cable.

2. Remove the center bezel from the instrument panel and place it on a workbench. Refer to REMOVAL .

3. Remove the four screws (1) that secure the A/C-heater control (2) to the instrument panel center bezel (3)

and remove the control.

INSTALLATION

CONTROL-A/C HEATER

Fig. 43: Removing/Installing Four Screws That Secure A/C-Heater Control To Instrument Panel Center
Bezel
Courtesy of CHRYSLER LLC

NOTE:

MTC A/C-heater control shown. ATC control similar.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

1. Install the A/C-heater control (2) onto the back of the instrument panel center bezel (3).

2. Install the four screws (1) that secure the A/C-heater control to the center bezel. Tighten the screws to 1.2

N.m (10 in. lbs.).

3. Position the center bezel to the instrument panel and connect the wire harness connectors to the back of

the A/C-heater control.

4. Connect the wire harness connectors to the accessory switches and install the center bezel. Refer to

INSTALLATION .

5. Reconnect the negative battery cable.

6. If required, initiate the Actuator Calibration function using a scan tool. See *HVAC SYSTEM TEST .

MODULE-POWER-BLOWER MOTOR

DESCRIPTION

DESCRIPTION

Fig. 44: Power-Blower Motor Module
Courtesy of CHRYSLER LLC

A blower motor power module is used on this model when equipped with the automatic temperature control

NOTE:

MTC A/C-heater control shown. ATC control similar.

NOTE:

The A/C-heater control will automatically perform the Actuator Calibration
function when the ignition is initially turned on when installing a new
control or when reinstalling the original control. However, the Actuator
Calibration function must be manually initiated using a scan tool if the
A/C-heater control has been previously installed in another vehicle (refer
to HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS for more
information).

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

(ATC) heating-A/C system. Models equipped with the manual temperature control (MTC) heating-A/C system
use a blower motor resistor, instead of the blower motor power module. See DESCRIPTION.

The blower motor power module is mounted to the rear of the HVAC housing, directly behind the glove box.
The blower motor power module consists of a molded plastic mounting plate (1) with an integral connector
receptacle (2). Concealed behind the mounting plate is the power module electronic circuitry and a finned
aluminum heat sink (3). The blower motor power module is accessed for service from under the instrument
panel.

The blower motor power module is accessed for service through the glove box opening.

OPERATION

MODULE-POWER-BLOWER MOTOR

The blower motor power module is connected to the vehicle electrical system through a dedicated lead and
connector. A second lead and connector is connected to the blower motor. The blower motor power module
allows the microprocessor-based automatic temperature control (ATC) A/C-heater control to calculate and
provide infinitely variable blower motor speeds based upon either manual blower switch input or the ATC
programming using a pulse width modulated (PWM) circuit strategy.

The PWM voltage is applied to a comparator circuit which compares the PWM signal voltage to the blower
motor feedback voltage. The resulting output drives the power module circuitry, which provides a linear output
voltage to change or maintain the desired blower speed.

The blower motor power module is diagnosed using a scan tool (refer to HEATING & AIR
CONDITIONING - ELECTRICAL DIAGNOSTICS for more information).

The blower motor power module cannot be adjusted or repaired must be replaced if inoperative or damaged.

REMOVAL

MODULE-POWER-BLOWER MOTOR

WARNING:

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.

WARNING:

The heat sink for the blower motor power module may get very hot during
normal operation. If the blower motor was turned on prior to servicing the
blower motor power module, wait five minutes to allow the heat sink to
cool before performing diagnosis or service. Failure to take this
precaution can result in possible personal injury.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

Fig. 45: HVAC Housing, Screws, Blower Motor Power Module & Wire Harness Connectors
Courtesy of CHRYSLER LLC

1. Disconnect and isolate the negative battery cable.

2. Lower the glove box door.

3. Disconnect the two wire harness connectors (4) from the blower motor power module (3).

4. Remove the two screws (2) that secure the blower motor power module to the HVAC housing (1) and

remove the power module.

INSTALLATION

MODULE-POWER-BLOWER MOTOR

Fig. 46: HVAC Housing, Screws, Blower Motor Power Module & Wire Harness Connectors
Courtesy of CHRYSLER LLC

NOTE:

LHD model shown. RHD model similar.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro