Aspen 2007, Durango 2005-2007

Removal & Installation

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  1. Disconnect the negative battery cable.
    CAUTION
    Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant.

  2.  
  3. Drain the engine coolant below the level of the thermostat housing or intake manifold.
  4.  
  5. Remove the air cleaner assembly if necessary for access to the sensor.
  6.  
  7. On 5.7L engines, carefully unbolt air conditioning compressor from front of engine. Do not disconnect any A/C hoses from compressor. Temporarily support compressor to gain access to ECT sensor.
  8.  
  9. Remove the connector from the sensor. On 3.7L and 4.7L engines with air conditioning it may be helpful to fabricate an L-shaped hook tool from a wire coat hanger about 8 in. long. Use the hook for removal rather than pulling on the wiring harness.
  10.  
  11. Disconnect electrical connector from sensor.
  12.  
  13. Remove sensor from intake manifold or cylinder block.

    Click image to see an enlarged view

    Fig. ECT sensor location-3.7L, 4.7L Engine



    Click image to see an enlarged view

    Fig. ECT sensor location-5.7L Engine



    Click image to see an enlarged view

    Fig. ECT sensor location-5.9L Engine. Thermostat housing removed for clarity.

  14.  

To install:

  1. Install the sensor and tighten to 8 ft. lbs. (11 Nm).
  2.  
  3. Install the connector on the sensor. There is no polarity: the connector cannot be accidentally reversed.
  4.  
  5. Connect the negative battery cable.
  6.  
  7. Inspect for leaks.
  8.  
  9. Install the engine cover.
  10.  

  1. Disconnect the negative battery cable.
    CAUTION
    Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant.

  2.  
  3. Drain the engine coolant below the level of the thermostat housing or intake manifold.
  4.  
  5. Remove the air cleaner assembly if necessary for access to the sensor.
  6.  
  7. On 5.7L engines, carefully unbolt air conditioning compressor from front of engine. Do not disconnect any A/C hoses from compressor. Temporarily support compressor to gain access to ECT sensor.
  8.  
  9. Remove the connector from the sensor. On 3.7L and 4.7L engines with air conditioning it may be helpful to fabricate an L-shaped hook tool from a wire coat hanger about 8 in. long. Use the hook for removal rather than pulling on the wiring harness.
  10.  
  11. Disconnect electrical connector from sensor.
  12.  
  13. Remove sensor from intake manifold or cylinder block.

    Click image to see an enlarged view

    Fig. ECT sensor location-3.7L, 4.7L Engine



    Click image to see an enlarged view

    Fig. ECT sensor location-5.7L Engine

  14.  

To install:

  1. Install the sensor and tighten to 8 ft. lbs. (11 Nm).
  2.  
  3. Install the connector on the sensor. There is no polarity: the connector cannot be accidentally reversed.
  4.  
  5. Connect the negative battery cable.
  6.  
  7. Inspect for leaks.
  8.  
  9. Install the engine cover.
  10.  

3.7L & 4.7L Engines



  1. Drain the cooling system.
  2.  
  3. Disconnect the sensor electrical connector.
  4.  
  5. Remove the ECT sensor.
  6.  

To install:

  1. Apply thread sealant to the sensor threads.
  2.  
  3. Install the ECT sensor into the engine block and tighten the mounting bolt to 8 ft. lbs. (11 Nm).
  4.  
  5. Connect the electrical connector.
  6.  
  7. Refill the cooling system to the correct level.
  8.  

5.7L Engine



  1. Drain the cooling system.
  2.  
  3. Remove the accessory drive belt.
  4.  
  5. Carefully unbolt the A/C compressor. Temporarily support the compressor to access the engine coolant temperature (ECT) sensor.
    NOTE
    It is not necessary to disconnect the A/C lines from the compressor.

  6.  
  7. Disconnect the sensor electrical connector.
  8.  
  9. Remove the ECT sensor from the engine block.
  10.  

To install:

  1. Apply thread sealant to the sensor threads.
  2.  
  3. Install the sensor into the engine block and tighten the mounting bolt to 8 ft. lbs. (11 Nm).
  4.  
  5. Connect the electrical connector.
  6.  
  7. Position the A/C compressor into place and tighten the mounting bolts.
  8.  
  9. Install the accessory drive belt.
  10.  
  11. Refill the cooling system to the correct level.
  12.  

 
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