Dodge Nitro. Manual - part 734

Fig. 17: Recirculation Door Actuator, Screws & Air Inlet Housing 
Courtesy of CHRYSLER LLC 

1. Disconnect and isolate the negative battery cable.  

2. On LHD models, remove the glove box bin. Refer to REMOVAL .  

3. On RHD models, remove the instrument panel. Refer to REMOVAL .  

4. Remove the two screws (2) that secure the recirculation door actuator (1) to the air inlet housing (3).  

5. Disconnect the wire harness connector from the recirculation door actuator and remove the actuator from 

the vehicle.  

INSTALLATION 

ACTUATOR-RECIRCULATION DOOR 

Fig. 18: Recirculation Door Actuator, Screws & Air Inlet Housing

NOTE:

LHD model shown. RHD model similar.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

Courtesy of CHRYSLER LLC 

1. Connect the wire harness connector to the recirculation door actuator (1).  

2. Position the recirculation door actuator to the side of the air inlet housing (3). Make sure the actuator 

output shaft is properly aligned to the recirculation door pivot shaft. If necessary, rotate the actuator 
slightly to engage the splines on the output shaft with those in the pivot shaft.  

3. Install the two screws (2) that secure the recirculation door actuator to the air inlet housing. Tighten the 

screws to 1.2 N.m (10 in lbs.).  

4. On RHD models, install the instrument panel. Refer to INSTALLATION .  

5. On LHD models, install the glove box bin. Refer to INSTALLATION .  

6. Reconnect the negative battery cable.  

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

CLUTCH-A/C COMPRESSOR 

DESCRIPTION 

CLUTCH-A/C COMPRESSOR 

Fig. 19: Bolt, Clutch Plate, Pulley Assembly, Stationary Electromagnetic Field Coil, Snap Ring & Shims 
Courtesy of CHRYSLER LLC 

The A/C system on models equipped with the 2.8L and 4.0L engine use a Zexel DKS-17DS A/C compressor. 
The clutch assembly for this A/C compressor consists of a stationary electromagnetic field coil (4), bearing and 
pulley assembly (3), shims (6), and a clutch plate (2) that is splined to the compressor shaft and secured by a 
bolt (1). These components provide the means to engage and disengage the A/C compressor from the engine 
accessory drive belt. 

The A/C clutch field coil is pressed onto the front of this A/C compressor and cannot be serviced separately 

NOTE:

LHD model shown. RHD model similar.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

from the compressor. The A/C clutch bearing and pulley assembly is retained to the front of the compressor by 
a snap ring (5) and can be serviced separately. 

CLUTCH-A/C COMPRESSOR 

Fig. 20: Bolt, Clutch Plate, Pulley Assembly, Stationary Electromagnetic Field Coil, Snap Ring & Shims 
Courtesy of CHRYSLER LLC 

The A/C system on models equipped with the 3.7L engine use the Visteon HS-18 A/C compressor. The clutch 
assembly for this A/C compressor consists of a stationary electromagnetic field coil (4), bearing and pulley 
assembly (3), shims (7), and a clutch plate (2) that is splined to the compressor shaft and secured by a bolt (1). 
These components provide the means to engage and disengage the A/C compressor from the engine accessory 
drive belt. 

The A/C clutch field coil is pressed onto the front of this A/C compressor and retained with a snap ring (6). The 

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

A/C clutch bearing and pulley assembly is also retained to the front of this compressor by a snap ring (5). Both 
the A/C clutch bearing and pulley assembly and the field coil can be serviced separately. 

OPERATION 

CLUTCH-A/C COMPRESSOR 

The A/C compressor clutch components provide the means to engage and disengage the A/C compressor from 
the engine accessory drive belt. When the electromagnetic A/C clutch field coil is energized, it magnetically 
draws the clutch plate into contact with the clutch pulley and drives the compressor shaft. When the coil is not 
energized, the pulley freewheels on the clutch hub bearing, which is part of the pulley assembly. 

A/C compressor clutch engagement is controlled by the powertrain control module (PCM) or the engine control 
module (ECM), depending on engine application. When the A/C-heater control is set to any A/C position, it 
sends a request signal on the CAN-B bus to the totally integrated power module (TIPM), which then transfers 
the request on the CAN-C Bus to the PCM/ECM, which determines if operating conditions are correct for A/C 
clutch engagement. When all operating conditions have been met, the PCM/ECM sends a signal on a dedicated 
hard-wired circuit back to the totally integrated power module (TIPM) to energize the internal A/C clutch high 
side driver. When energized, the A/C clutch high side driver provides battery current to the A/C clutch field 
coil. 

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

The A/C compressor clutch components cannot be adjusted or repaired and must be replaced if found 
inoperative or damaged. 

DIAGNOSIS AND TESTING 

CLUTCH-A/C COMPRESSOR 

The A/C compressor clutch coil electrical circuit is controlled by the powertrain control module (PCM) or the 
engine control module (ECM) (depending on engine application) through the totally integrated power module 
(TIPM). See OPERATION. Begin testing of a suspected compressor clutch coil problem by performing the 
preliminary checks. 

PRELIMINARY CHECKS 

1. Using a scan tool, check for diagnostic trouble codes (DTCs) in the A/C-heater control, TIPM and the 

PCM/ECM. If no DTCs are found, go to step 2. If any DTCs are found, repair as required.  

2. If the A/C compressor clutch still will not engage, verify the refrigerant charge level. See 

REFRIGERANT SYSTEM LEAKS. If the refrigerant charge level is OK, go to step 3. If the refrigerant 
charge level is not OK, adjust the refrigerant charge as required.  

3. If the A/C compressor clutch still will not engage, disconnect the wire harness connector from the A/C 

pressure transducer and check for battery current at the connector with the engine running and the A/C-
heater control set to the A/C mode. If OK, go to step COIL CURRENT DRAW TEST, and/or step 
COIL RESISTANCE TEST - 2.8L AND 4.0L ENGINES ONLY. 

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro