Ram 1500, 2500, 3500, 2WD and 4WD, 2001-2005

Removal & Installation

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  1. The engine should be cold when performing this procedure.
  2.  
  3. Disconnect the battery negative cable.
  4.  
  5. Drain engine coolant to below sending unit level. A quart or so should be sufficient.
  6.  
  7. Disconnect the wiring from the temperature gauge sending unit.
  8.  
  9. Unscrew the old sending unit.
  10.  

To install:

  1. Coat the threads of the new unit with Teflon®tape or a temperature-resistant sealer.
  2.  
  3. Tighten the sensor to 11-15 ft lbs. (15-20 Nm).
  4.  
  5. Reconnect wiring. Start the engine and check operation. Check for leaks at operating temperature.

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    Fig. On 3.9L, 5.2L and 5.9L gas engines, the coolant temperature sensor is just behind the

    On 3.9L, 5.2L and 5.9L gas engines, the coolant temperature sensor is just behind the

    Click image to see an enlarged view

    Fig. Coolant temperature sensor position on the 4.7L engine

    Coolant temperature sensor position on the 4.7L engine

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    Fig. Coolant temperature sensor location-8.0L engine

    Coolant temperature sensor location-8.0L engine

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    Fig. Coolant temperature sensor-5.9L diesel engine

    Coolant temperature sensor-5.9L diesel engine
  6.  


CAUTION
Hot, pressurized coolant can cause injury by scalding. Cooling system must be partially drained before removing coolant temperature sensor.

The engine coolant temperature sensor is installed into a water jacket at front of intake manifold near rear of generator. If equipped with a 5.2L or 5.9L V-8 engine, removal/installation may be done from front of vehicle without removal of engine cover or air cleaner housing. If equipped with a 3.9L V-6 engine, the engine cover and air cleaner housing must be removed.

  1. Disconnect the negative battery cable.
  2.  
  3. For 3.9L engines:
    1. Remove engine cover.
    2.  
    3. Remove air cleaner housing.
    4.  

  4.  
  5. Place a small mirror above sensor connector.
  6.  
  7. Disconnect electrical connector from sensor. When removing connector from sensor, do not pull directly on wiring harness. Fabricate an L-shaped hook tool from a coat hanger (approximately eight inches long). Place hook part of tool under connector for removal. The connector is snapped onto the sensor. It is not equipped with a lock type tab.
  8.  
  9. Partially drain cooling system.
  10.  
  11. Remove sensor from intake manifold.
  12.  

To install:

  1. Install sensor into intake manifold and tighten to 8 ft. lbs. (11 Nm).
  2.  
  3. Connect electrical connector to sensor. The sensor connector is symmetrical (not indexed). It can be installed to the sensor in either direction.
  4.  
  5. Refill any the engine cooling system.
  6.  
  7. For 3.9L engines:
    1. Install air cleaner housing.
    2.  
    3. Install engine cover.
    4.  

  8.  
  9. Connect the negative battery cable.
  10.  

 
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