Dodge Nitro. Manual — part 728

If equipped, slowly turn the Rear Blend switch on the Rear A/C Heater Control to full hot, wait 30
seconds and then turn it back to full cold.

If equipped, turn the Rear Fan switch on the Rear A/C Heater Control to off.

If equipped with rear HVAC, with the scan tool, select the following: Actuators, Auxiliary Coolant Pump,
Start, and Constant On. Allow the pump to run for approximately one minute.

Does the scan tool display any active DTCs?

Yes

Diagnose and repair the DTC(s). Refer to the DIAGNOSTIC CODE INDEX for a complete list of
HVAC related symptoms.

No

As necessary, either go to step 4) or step 5), or Perform BODY VERIFICATION TEST - VER
1 .

4) ACTUATOR DTC DETECTION TEST

With the scan tool, select System Tests and then select Actuator DTC Detection. When the test is
complete, select View DTCs.

Does the scan tool display any DTCs?

Yes

Diagnose and repair the DTC(s). If multiple DTCs are present, beginning with the common
circuits, diagnose and repair all short high DTCs and then all short low DTCs. Refer to the
DIAGNOSTIC CODE INDEX for a complete list of all HVAC related symptoms.

No

Perform BODY VERIFICATION TEST - VER 1 .

5) ACTUATOR CALIBRATION TEST

With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is
complete, select View DTCs.

Does the scan tool display any DTCs?

Yes

Diagnose and repair the DTC(s). Refer to the DIAGNOSTIC CODE INDEX for a complete list of
all HVAC related symptoms.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

No

No problem found.

Perform BODY VERIFICATION TEST - VER 1 .

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

2007 HVAC

Heating & Air Conditioning - Service Information - Nitro

HVAC - SERVICE INFORMATION

DESCRIPTION

HEATER AND AIR CONDITIONER SYSTEM

A manual temperature control (MTC) single zone type heating-A/C system or an automatic temperature
controlled (ATC) single zone type heating-A/C system is available on this model.

To maintain the performance level of the heating, ventilation and air conditioning (HVAC) system, the engine
cooling system must be properly maintained. The use of a bug screen is not recommended. Any obstructions in
front of the radiator or A/C condenser will reduce the performance of the A/C and engine cooling systems.

The engine cooling system includes the radiator, thermostat, radiator hoses and the engine coolant pump. Refer
to COOLING for more information before opening or attempting any service to the engine cooling system.

Fig. 1: HVAC Housing Assembly
Courtesy of CHRYSLER LLC

All vehicles are equipped with a common heater, ventilation and air conditioning (HVAC) housing assembly
(1). The heating-A/C system combines A/C, heating, and ventilating capabilities in a single HVAC housing
mounted within the passenger compartment behind the instrument panel. The HVAC housing assembly
includes:

Mode-air doors (2)

A/C evaporator (3)

NOTE:

LHD model shown. RHD model similar.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

Recirculation door actuator (4)

Air inlet housing (5)

Recirculation-air door (6)

Blower motor (7)

Blower motor resistor (8)

Heater core (9)

Air distribution housing (10)

Blend-air door (11)

Blend door actuator (12

Floor distribution ducts (13)

Mode door actuator (14)

Based upon the mode selected, conditioned air can exit the HVAC housing through one or a combination of the
three main housing outlets: defrost, panel or floor. The defrost and panel outlets are located on the top of the
housing and the floor outlets are located on each side of the housing. Once the conditioned air exits the HVAC
housing, it is further directed through molded plastic ducts to the outlets within the vehicle interior. These
outlets and their locations are as follows:

Defroster Outlet - Dual defroster outlets are located in the center of the instrument panel top cover, near
the base of the windshield.

Side Window Demister Outlets - There are two side window demister outlets, one is located at each
outboard end of the instrument panel and are integral to the instrument panel air outlets.

Panel Outlets - There are four panel outlets in the instrument panel, one located near each outboard end
of the instrument panel facing the rear of the vehicle and two located near the top of the instrument panel
center bezel.

Front Floor Outlets - There are two front floor outlets, one located above each side of the center of the
floor panel near the dash panel.

Rear Floor Outlets - There are two rear floor outlets, one located on each side of the floor console near
the rear of each front seat.

OPERATION

HEATER AND AIR CONDITIONER SYSTEM

Both the manual temperature control (MTC) and the automatic temperature controlled (ATC) heating-A/C
systems are blend-air type systems. In a blend-air system, a blend-air door controls the amount of conditioned
air that is allowed to flow through, or around the heater core. This design allows almost immediate control of

NOTE:

An electric positive temperature coefficient (PTC) heater is used on vehicles
when equipped with the 2.8L diesel engine. The PTC heater unit compensates
for the lower engine coolant temperatures produced by the diesel engine. The
PTC heater unit is mounted in the HVAC air distribution housing, downstream
of the heater core. See DESCRIPTION for more information.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro