Question about Buick Rendezvous

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My Temperature gauge moves all around usually its way below the middle line or a little past the middle line. What sensor do i need to replace to get it working right? The - Engine Temperature Sensor? Or The - Coolant Temp Sensor?

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  • cody314 Apr 26, 2010

    Okay thank you.

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You will need to change the Coolant temp sensor for it to read right on the dash.

Good Luck

Posted on Apr 26, 2010

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The tempertature gauge does not work on my jeep what may be the problem?


Could be the coolant temp sensor:


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4.0L engine shown




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5.2L engine shown



To test it:

Perform this test on a cold or cool engine.
  1. Disconnect the negative (-) battery cable.
  2. Unplug the electrical wiring from the sending unit.
  3. Using an ohmmeter, measure the resistance between the terminal and the sending unit's metal body
    1. Infinite resistance or zero resistance: the sending unit is bad, replace the sender with a new one.
    2. Other than infinite or zero resistance: continue test.
  4. Remove the temperature sender from the engine.
  5. Position the sending unit so the metal shaft (opposite end from the electrical connectors) is in a pot of water. Make sure that the electrical connector is not submerged and only the tip of the sending unit's body is in the water.
  6. Heat the pot of water at a medium rate. While the water is warming, continue to measure the resistance of the terminal and the metal body of the sending unit:
    1. As the water warms up, the resistance goes down in a steady manner: the sending unit is good.
    2. As the water warms up, the resistance does not change or changes in erratic jumps: the sender is bad, replace it with a new one.
  7. Install the good or new sending unit into the engine, then connect the negative battery cable.
  1. With the engine cold, remove the ECT sensor.
  2. Immerse the tip of the sensor in container of water.
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the sensor resistance illustration.
  5. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  6. If the sensor does not meet specification, it must be replaced.

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Submerge the end of the temperature sensor in cold or hot water and check resistance


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Temperature-to-resistance relationship of the ECT and MAT sensors

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It will look similar to this...

5a029f4.jpg

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