S&T Series Blazer, Bravada, Envoy, Jimmy, Rainier, Trailblazer, Xtreme

Coolant Temperature Sender

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Operation



The coolant temperature sender changes resistance as the coolant temperature increases and decreases.

Removal & Installation



  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine cooling system to a level below the sensor.
  4.  
  5. Release the locktab and disengage the sensor connector.
  6.  
  7. Using a special sensor tool or a deep 12-point socket, loosen the sensor, then carefully unthread and remove it from the engine.
  8.  

To install:

  1. Thread the sensor into the engine by hand, then tighten using the socket or tool. If a replacement sensor came with instructions use a torque wrench to assure proper tightening.
    NOTE
    The manufacturer suggests coating the coolant sensor threads with a sealant such as 1052080, or equivalent.

  2.  
  3. Engage the sensor wiring harness.
  4.  
  5. Connect the negative battery cable.
  6.  
  7. Properly refill the engine cooling system, then run the engine and check for leaks.
  8.  

Testing



  1. Remove the sender from the vehicle.
  2.  
  3. Place the sender in a container of water.
  4.  
  5. Connect one lead of a ohmmeter to the sender terminal and the other lead to the sender body.
  6.  
  7. Place a thermometer in the container of water and heat the water.
  8.  
  9. When the water is cool the resistance should be high. As the water temperature increases the resistance should decrease smoothly.
  10.  
  11. If not, the sender is probably faulty.
  12.  

 
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