Dodge Nitro. Manual - part 743

 

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Dodge Nitro. Manual - part 743

 

 

Fig. 50: Evaporator Temperature Sensor, A/C Evaporator, HVAC Housing & Connector Receptacle 
Courtesy of CHRYSLER LLC 

The evaporator temperature sensor (1) measures the temperature of the conditioned air downstream of the A/C 
evaporator (2). The evaporator temperature sensor is an electrical thermistor within a molded plastic case that is 
inserted into rear the HVAC housing (3) near the coldest point of the A/C evaporator. Two terminals within the 
connector receptacle (4) connect the sensor to the vehicle electrical system through a wire lead and connector of 
the instrument panel wire harness. 

The external location of the evaporator temperature sensor allows the sensor to be removed or installed without 
disturbing the refrigerant in the A/C system. 

OPERATION 

NOTE:

Typical evaporator temperature sensor shown.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

SENSOR-EVAPORATOR TEMPERATURE 

The evaporator temperature sensor monitors the temperature of the conditioned air downstream of the A/C 
evaporator and supplies an input signal to the A/C-heater control. The A/C-heater control uses the evaporator 
temperature sensor input signal to optimize A/C system performance and to protect the A/C system from 
evaporator freezing. The evaporator temperature sensor will change its internal resistance in response to the 
temperatures it monitors and is connected to the A/C-heater control through sensor ground circuit and a 5-volt 
reference signal circuit. As the temperature of the A/C evaporator decreases, the internal resistance of the 
evaporator temperature sensor decreases. 

The A/C-heater control uses the monitored voltage reading as an indication of evaporator temperature. The 
A/C-heater control is programmed to respond to this input by requesting the powertrain control module (PCM) 
or the engine control module (ECM) (depending on engine application) to cycle the A/C compressor clutch as 
necessary to optimize A/C system performance and to protect the A/C system from evaporator freezing. 

The evaporator temperature sensor is diagnosed using a scan tool. See HEATING & AIR CONDITIONING -
ELECTRICAL DIAGNOSTICS
 for more information. 

The evaporator temperature sensor cannot be adjusted or repaired and must be replaced if found inoperative or 
damaged. 

REMOVAL 

SENSOR-EVAPORATOR TEMPERATURE 

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.

NOTE:

Illustration shown with instrument panel removed for clarity.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

Fig. 51: Removing/Installing Evaporator Temperature Sensor From Front Of HVAC Housing 
Courtesy of CHRYSLER LLC 

1. Disconnect and isolate the negative battery cable.  

2. Partially remove the instrument panel to gain access to the evaporator temperature sensor (1) located in 

the rear of the HVAC housing (2), near the bottom of the instrument panel on the passenger side. Refer to 
REMOVAL .  

3. Disconnect the instrument panel wire harness connector from the evaporator temperature sensor and 

remove the sensor from the HVAC housing.  

INSTALLATION 

SENSOR-EVAPORATOR TEMPERATURE 

NOTE:

LHD model shown. RHD model similar.

NOTE:

Illustration shown with instrument panel removed for clarity.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

Fig. 52: Removing/Installing Evaporator Temperature Sensor From Front Of HVAC Housing
Courtesy of CHRYSLER LLC
 

1. Install the evaporator temperature sensor (1) into rear of the HVAC housing (2) and connect the 

instrument panel wire harness connector.  

2. Install the instrument panel. Refer to INSTALLATION .  

3. Reconnect the negative battery cable.  

SENSOR-INFRARED 

DESCRIPTION 

SENSOR-INFRARED 

Fig. 53: Infrared Temperature Sensor, Integral Wire Connector Receptacle, Alignment Tabs & Clear 
Lens
 
Courtesy of CHRYSLER LLC 

The infrared temperature sensor (1) consists of an infrared transducer concealed behind a clear lens (4) located 
in a molded plastic housing with an integral wire connector receptacle (2) and mounting and alignment tabs (3 
and 5). 

The infrared sensor is used only on models equipped with the automatic temperature control (ATC) heating-
A/C system. 

OPERATION 

SENSOR-INFRARED 

The infrared sensor detects thermal radiation emitted by the driver and front seat occupants and surroundings 

NOTE:

LHD model shown. RHD model similar.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

 

 

 

 

 

 

 

Content   ..  741  742  743  744   ..