Nissan Maxima 1993-1998 Repair Guide

Thermal Transmitter (Coolant Temperature Sender Unit)

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See Figure 1

The Thermal Transmitter is used to send a signal to the temperature gauge on the instrument cluster, indicating engine coolant temperature.



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Fig. Fig. 1: Location of the thermal sending unit (A) next to the coolant temperature sensor (B)

TESTING



See Figure 2


CAUTION
During this procedure, the engine will running; use extreme caution. Keep clear of moving parts.

the engine should be at normal operating temperature before performing this procedure.

  1. Turn off the engine.
  2.  
  3. Disconnect the transmitter sender wire.
  4.  
  5. Using an ohmmeter, check the resistance between the transmitter wire terminal and ground.
  6.  
  7. The resistance between the terminal and ground should be between 70-90 ohms when the coolant temperature is approximately 140°F (60°C).
  8.  
  9. When the coolant temperature is approximately 212°F (100°C), there should be between 21 to 24 ohms of resistance between the transmitter wire terminal and ground.
  10.  



Click image to see an enlarged view

Fig. Fig. 2: Use an ohmmeter to check the function of the thermal transmitter

  1. If the resistance is not within specifications, it should be replaced.
  2.  
  3. Connect the transmitter sender wire.
  4.  

REMOVAL & INSTALLATION



  1. Disconnect the transmitter sender wire.
  2.  
  3. Unscrew the thermal transmitter from the engine.
  4.  

To install:
  1. Dress the threads of the thermal transmitter with sealant.
  2.  
  3. Screw the transmitter into the housing, and attach the wire.
  4.  

 
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