Mazda 323/MX-3/626/MX-6/Millenia/Protégé 1990-1998 and Ford Probe 1993-1997

Coolant Temperature Sender

Print

TESTING



See Figure 1

  1. Detach the single wire harness connector from the temperature sender.
  2.  
  3. Ground the connector to the engine block and verify that the gauge has gone to full HOT reading.
  4.  
  5. If the gauge is working, proceed with the test procedure. If not, inspect the wire harness between the sender and the gauge.
  6.  
  7. Remove the coolant temperature sender from the engine.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: Submerge the end of the temperature sender in cold or hot water and check resistance

  1. Place the sender unit into a container of water.
  2.  
  3. Attach an ohmmeter to the coolant temperature sender connector and the sender body.
  4.  
  5. Heat the water to the temperature specified and read the meter.

    1990-92 626 and MX-6 models: 49-58ohms at 176°F (80°C)
     
    1995-98 Protege models: 153ohms at 129°F (54°C)
     
    All other models: 190-259ohms at 122°F (50°C)
     

  6.  
  7. If the meter does not read as specified, replace the sender.
  8.  

REMOVAL & INSTALLATION



See Figures 2 and 3

  1. Drain and recycle the engine coolant.
  2.  
  3. Detach the single wire harness connector from the temperature sender.
  4.  



Click image to see an enlarged view

Fig. Fig. 2: The coolant temperature sender is a single wire unit, usually located near, or on, the water outlet or thermostat housing

  1. Remove the sender from the engine by turning it counterclockwise.
  2.  
  3. Installation is the reverse of the removal procedure. When installing the sender, count three threads up the sender then apply sealant from the third thread to the head of the sender. Tighten the sender to 3-82 inch lbs. (6.4-9.3 Nm).
  4.  



Click image to see an enlarged view

Fig. Fig. 3: When installing the sender, count three threads up the sender then apply sealant from the third thread to the head of the sender.

 
label.common.footer.alt.autozoneLogo