Dodge Nitro. Manual - part 740

Fig. 39: Compressor Clutch Field Coil Connector, Connector Bracket, Compressor Shaft Bolt, 
Clutch Plate & A/C Compressor 
Courtesy of CHRYSLER LLC 

4. Install the clutch plate (4) onto the front of the A/C compressor (5).  

5. Install the compressor shaft bolt (3). Tighten the bolt to 20 N.m (177 in. lbs.). 

NOTE:

The shims may compress after tightening the shaft bolt. Check the air gap 
in four or more places to verify the air gap is correct. Spin the pulley 
before performing a final check of the air gap.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

6. With the clutch plate assembled tight against the shim(s), measure the air gap between the clutch plate 

and the pulley and bearing assembly. The air gap should be between 0.30 - 0.60 mm (0.012 - 0.024 in.). If 
the air gap is not between specifications, add or subtract shims as needed until the correct air gap is 
obtained. 

7. Carefully route the compressor clutch field coil wire lead and install the connector bracket (2) and 

retaining screw onto the A/C compressor. Tighten the screw to 4.3 N.m (38 in. lbs.).  

8. Connect the engine wire harness to the (1).  

9. Install the accessory drive belt. Refer to INSTALLATION .  

10. Install the radiator and fan shroud assembly. Refer to INSTALLATION .  

11. Install the coolant recovery container. Refer to REMOVAL .  

12. Reconnect the negative battery cable.  

CONTROL-A/C HEATER 

DESCRIPTION 

CONTROL-A/C HEATER 

Fig. 40: A/C Heater Control 
Courtesy of CHRYSLER LLC 

The A/C-heater control (1) for the manual temperature control (MTC) single zone heating-A/C system allows 

NOTE:

On models with the clutch plate recessed into the pulley, use a 90° wire 
gap gauge to measure the clutch air gap. On other models, use a blade 
type feeler gauge to measure the air gap.

CAUTION: Be certain that the compressor clutch field coil wire lead is routed so 

that it is not pinched between the A/C compressor and the field coil 
connector bracket.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

one temperature setting for the entire vehicle. All controls are identified by ISO graphic symbols.

The A/C-heater control and integral computer is located in the instrument panel and contains: 

A rotary control for fan speed selection and for turning the heating-A/C system on and off (2). This 
control which also contains a push button function for turning the rear window defogger system on and 
off. The control contains an indicator lamp that illuminates when the rear window defogger system is in 
operation.  

A rotary control for temperature control of the discharged air (3). This control also contains a push button 
function for turning the A/C system on and off. The control contains an indicator lamp that illuminates 
when the A/C system is in operation.  

A rotary control for mode control of the discharged air (4). This control also contains a push button 
function for recirculating the conditioned air. The control contains an indicator lamp that illuminates 
when the heating-A/C system is in recirculation mode.  

The A/C-heater control for this heating and A/C system is diagnosed using a scan tool (refer to HEATING & 
AIR CONDITIONING - ELECTRICAL DIAGNOSTICS for more information). 

Prior to replacing an A/C-heater control, check for any diagnostic trouble codes (DTCs) related to the heating-
A/C system and run the Actuator Calibration function using a scan tool to verify that the concern is not a system 
issue. See *HVAC SYSTEM TEST . 

The A/C-heater control cannot be adjusted or repaired and must be replaced if inoperative or damaged. 

AUTOMATIC SINGLE ZONE 

Fig. 41: A/C-Heater Control 
Courtesy of CHRYSLER LLC 

The A/C-heater control for the automatic temperature control (ATC) single zone system maintains the interior 
comfort level desired by the vehicle operator. This is accomplished by use of infrared sensors located in the 
front overhead console and at the left rear of the headliner that measure the surface temperature of the driver 

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

and front and rear seat passengers. Based on the sensors input, the system automatically adjusts the air 
temperature, airflow volume, airflow distribution and amount of inside air recirculation to maintain occupant 
comfort, even under changing outside weather conditions. All controls are identified by ISO graphic symbols. 

This ATC system offers several manual override features such as fan speed, airflow distribution and when the 
outside air contains smoke, odors, high humidity, or if rapid cooling is desired, the interior conditioned air can 
be recirculated within the vehicle. 

The heating-A/C system uses electrically operated controls. These controls provide the vehicle operator with a 
number of setting options to help control the climate and comfort within the vehicle. 

The A/C-heater control and integral computer (1) is located in the instrument panel and contains: 

A rotary control for manual and automatic blower motor speed selection and for turning the heating-A/C 
system on and off (2). This control also contains a push button function for turning the rear window 
defogger system on and off. The control contains an indicator lamp that illuminates when the rear 
window defogger system is in operation.  

A rotary control for temperature control of the discharged air (3). This control also contains a push button 
function for manually turning the A/C system on and off. The control contains an indicator lamp that 
illuminates when the A/C system is in operation.  

A rotary control for manual and automatic mode control of the discharged air (4). This control also 
contains a push button function for recirculating the conditioned air. The control contains an indicator 
lamp that illuminates when the heating-A/C system is in recirculation mode.  

The A/C-heater control for the ATC heating and A/C system obtains vehicle speed, engine speed, engine 
coolant temperature, ambient temperature and refrigerant system head pressure data from the CAN-IHS bus and 
is diagnosed using a scan tool (refer to 24 - HVAC Electrical Diagnostics for more information). 

Prior to replacing an A/C-heater control, check for any diagnostic trouble codes (DTCs) related to the heating-
A/C system and run the Actuator Calibration function using a scan tool to verify that the concern is not a system 
issue. See *HVAC SYSTEM TEST . 

The A/C-heater control cannot be adjusted or repaired and must be replaced if inoperative or damaged. 

REMOVAL 

CONTROL-A/C HEATER 

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.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro