GM Full-Size Trucks 1988-1998 Repair Information

Coolant Temperature Sender

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OPERATION



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

TESTING



  1. Check the instrument cluster fuse condition and replace as necessary.
  2.  
  3. Check the sender wire for damage and repair as necessary.
  4.  
  5. Unplug the sender electrical connection.
  6.  
  7. Attach one end of a jumper wire to the sender electrical connector and the other end of the jumper wire to ground.
  8.  
  9. If the gauge functions properly, replace the sender.
  10.  

REMOVAL & INSTALLATION



See Figures 1, 2, 3 and 4

  1. Disconnect the negative battery cable and drain the engine coolant.
  2.  
  3. Disconnect the sensor electrical lead and unscrew the sensor.
  4.  

To install:
  1. Install the sensor and tighten it to 17 ft. lbs. (23 Nm). Connect the electrical lead.
  2.  
  3. Connect the battery cable and fill the engine with coolant.
  4.  



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Fig. Fig. 1: Coolant temperature and oil pressure senders-4.3L engines



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Fig. Fig. 2: Coolant temperature and oil pressure senders-5.0L and 5.7L engines



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Fig. Fig. 3: Coolant temperature and oil pressure senders-7.4L engines



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Fig. Fig. 4: Coolant temperature and oil pressure senders-6.2L and 6.5L diesel engines

 
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