Dodge Nitro. Manual - part 755

Fig. 109: Removing/Installing Nuts That Secure HVAC Housing Assembly To Passenger Side Of Dash 
Panel 
Courtesy of CHRYSLER LLC 

1. Position the HVAC housing assembly (2) to the passenger side of the dash panel (3). Be certain that the 

housing is correctly located over the two dash panel mounting studs.  

2. Install the two nuts (1) that secure the HVAC housing assembly to the dash panel. Tighten the nuts to 4.5 

N.m (40 in. lbs.).  

3. Install the rear floor duct. See INSTALLATION.  

4. Install the instrument panel. Refer to INSTALLATION . 

Fig. 110: Suction Line Assembly, Nuts, A/C Expansion Valve, Heater Hoses & Dash Panel 
Courtesy of CHRYSLER LLC 

5. Install the nut (6) that secures the HVAC housing assembly to the engine compartment side of the dash 

panel (5). Tighten the nut to 4.5 N.m (40 in. lbs.).  

6. Remove the previously installed plugs or caps and connect the heater hoses (4) to the heater core tubes. 

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

7. Remove the tape or plugs from the refrigerant line fittings and the expansion valve ports.  

8. Lubricate new rubber O-rings with clean refrigerant oil and install them onto the liquid and suction line 

fittings. Use only the specified O-ring seals as they are made of special materials compatible to the R-
134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.  

9. Connect the A/C liquid and suction line assembly (1) to the A/C expansion valve (3).  

10. Install the nut (2) that secures the A/C liquid and suction line assembly to the A/C expansion valve. 

Tighten the nut to 23 N.m (17 ft. lbs.).  

11. Reconnect the negative battery cable.  

12. If the heater core is being replaced, flush the cooling system. Refer to STANDARD PROCEDURE .  

13. Refill the engine cooling system. Refer to STANDARD PROCEDURE .  

14. Evacuate the refrigerant system. See REFRIGERANT SYSTEM EVACUATE.  

15. Charge the refrigerant system. See REFRIGERANT SYSTEM EVACUATE.  

16. Initiate the Actuator Calibration function using a scan tool. See *HVAC SYSTEM TEST .  

HOUSING-AIR INLET 

Fig. 111: Screw, Plastic Retaining Tabs, Air Inlet Housing & HVAC Housing 
Courtesy of CHRYSLER LLC 

1. Position the air inlet housing (3) to the top of the HVAC housing (4) and engage the front of the inlet 

housing to the two plastic retaining tabs (2) located on the top of the HVAC housing.  

2. Firmly push down on the rear of the air inlet housing and engage the inlet housing to the HVAC housing. 

Make sure the two housings are fully engaged to each other.  

3. Install the screw (1) that helps secure the rear of the air inlet housing to the HVAC housing. Tighten the 

screw to 1.2 N.m (10 in. lbs.).  

4. Install the HVAC housing assembly. See INSTALLATION. 

NOTE:

Typical housing shown. RHD model similar.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

MOTOR-BLOWER 

DESCRIPTION 

MOTOR-BLOWER 

Fig. 112: Blower Motor, Squirrel Cage-Type Blower Wheel, Integral Wire Harness Connector & Integral 
Mounting Tabs 
Courtesy of CHRYSLER LLC 

The blower motor (1) is a 12-volt, direct current (DC) motor mounted within a plastic housing with three 
integral mounting tabs (4), an integral wire harness connector (3) and a squirrel cage-type blower wheel (2) that 
is secured to the blower motor shaft. The blower motor wheel is positioned within the HVAC air inlet housing, 
which is mounted to the passenger side end of the HVAC housing. 

The blower motor can be accessed for service from underneath the instrument panel. 

OPERATION 

MOTOR-BLOWER 

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. 

The blower motor will operate whenever the ignition switch is in the Run position and the blower motor control 
is in any position except Off. The blower motor receives battery current through the totally integrated power 
module (TIPM) whenever the ignition switch is in the Run position. 

Blower motor speed is controlled by regulating the ground path through or around the blower motor resistor and 
through the blower motor control located within the A/C-heater control.

NOTE:

Typical blower motor shown,

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

The blower motor can be accessed for service from underneath the instrument panel. 

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

The blower motor and blower motor wheel are factory balanced as an assembly and cannot be adjusted or 
repaired and must be replaced if found inoperative or damaged. 

DIAGNOSIS AND TESTING 

MOTOR-BLOWER 

To determine if an open condition exists within the blower motor circuit wiring, it is necessary to disconnect the 
negative battery cable and check for continuity within the blower motor circuits using an ohmmeter. For circuit 
descriptions and diagrams, refer to Air Conditioning/Heater in SYSTEM WIRING DIAGRAMS . 

OPERATION 

Possible causes of an inoperative blower motor include: 

Open fuse  

Inoperative blower motor resistor  

Inoperative blower motor switch  

Inoperative blower motor  

Inoperative blower motor circuit wiring or wire harness connectors  

NOISE 

To determine if the blower motor is the source of the noise, simply switch the blower motor from Off to On. To 

NOTE:

The blower motor is supplied with a 12V feed from the TIPM, through the blower 
motor resistor, whenever the ignition switch is in the RUN position. Due to an 
open circuit condition within the blower motor control switch the TIPM is 
UNABLE to detect an OPEN circuit for the 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. Failure to take the proper precautions could result in 
accidental airbag deployment and possible personal injury or death.

NOTE:

The blower motor is supplied with a 12V feed from the TIPM, through the blower 
motor resistor, whenever the ignition switch is in the RUN position. Due to an 
open circuit condition within the blower motor control switch the TIPM is 
UNABLE to detect an OPEN circuit for the blower motor.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro