Question about 2005 Buick Rendezvous

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I replace the temperature sensor and now my gauge is not working why

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The temperature sensor has nothing to do with the temperature gauge . The temp sensor controls the fan operation and the CPU operations while the temp gauge sender unit is a heat controlled resistor that alters the voltage through the gauge. check that you have replace the wires on the correct unit .

Posted on Feb 17, 2014

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Why does the temperature gauge on my 1995 Chevy K2500, 5.7L read 150 degrees ?


If you replaced the SENSOR and not the gauge SENDER, there's your answer.

The SENSOR sends the computer (ECM, PCM, ECU, etc.) the engine temp so it can make the adjustments to the fuel, timing etc.

The gauge SENDER makes the gauge read what temperature the engine coolant is.

Hope the helps.

Feb 21, 2015 | 1995 Chevrolet K2500

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Which fuse is for temperature gauge on dashboard


  • The temperature gauge is not on a fuse of its own, it would work with all the instruments, ie fuel gauge, warning lights etc. If the temp gauge does not work and the fuel gauge does,, look for the problem elsewhere such as the sender unit on the engine. A quick check is to remove the wire from the sensor unit on the engine and short it out to ground. If the gauge picks up, replace the sensor unit.
  • Otherwise, check the wire itself for breaks, or bad connections.

Sep 27, 2014 | Cars & Trucks

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I have a 2007 Chevrolet Equinox and had my cluster repaired for the temp gauge. Now it works but will not drop the entire way after it cools down. I was told that this is a temp problem with GM vehicles...


From what I just read about your vehicle,it has a history problem with the gauge,may be the coolant temperature sender or the gauge,it says the whole cluster will have to be changed to be fixed if the gauge is bad,found some forums and all had gauge problems.Right above the coolant temperature sensor is the coolant temperature sender,this is what sends the temperature to your gauge,the sensor sends a signal to the computer,they may have replaced the wrong one,here's a link to the sensor,the hole above it is where the sender goes,it's a one prong part,the sensor is a 2 prong part.A lot of people don't know that there are 2 types of coolant temperature gauge sending unit and sensor.

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Temperature gauge goes from zero to overheat


Your coolant temperature sensor is bad,it's screwed into engine by thermostat housing,easy to remove,just disconnect electrical connector and get wrench and remove.

Jan 20, 2013 | Cars & Trucks

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I had a water leak on my 1996 GMC K1500 and ran hot. Fixed problem truck running good, but the temperature gauge is pegged high even with a new sensor. How do I fix the gauge?


Pull off the negative battery cable and unplug the sensor. See if the gauge needle returns to normal. Try tapping on the cluster to unstick the needle. No luck? Replace the temperature gauge.

Oct 23, 2012 | Cars & Trucks

1 Answer

My needle for my temperature gauge is not workin it points down tha hole time and i replaced the sensor what else could it be


First off you need to make sure you replaced the right sensor alot of vehicles are equipped with two coolant sensors on feeds the computer information and the other sensor registers temperature on your gauge so make sure you replaced the right one.If you did replace the right one then possibilities are a break in the wire from the coolant sensor to the temperature gauge on your dash also could be your temperature gauge on your dash could be faulty.

Jul 27, 2011 | 2004 Chevrolet Impala

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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

Apr 28, 2010 | 1995 Jeep Grand Cherokee

1 Answer

Teampreature gauge not working


Sounds like you have installed a 'over-temperature switch' type sender unit- this type of sensor is only meant to control an over-temperature alarm indicator lamp that is either 'on' or 'off'.

The temperature gauge requires a 'variable resistance type' temperarure sensor to control the meter deflection.
When cold the temperature sensor is of high resistance, hence less meter deflection;
when hot temperature sensor is of low resistance, hence more meter deflection.

You need to procure a matching sensor to suit the type of gauge installed.

Is it possible you have connected to the temperature wrong temperature sensor? - most vehicles are fitted with both a gauge type (variable resistance) sensor to drive the temperature gauge, as well as a switch type (on or off) sensor to drive the overtemp indicator light.

Jun 03, 2009 | 1983 Ford Econoline

1 Answer

Temperature gauge not working,stay cold


Hi. the vdc at the sensor seems to be fine. if the ground is sufficient, i would replace the gauge. its malfunctioning. Check for loose connection at gauge before replacing the gauge.

May 14, 2009 | 1997 Ford Contour

2 Answers

Heating System


The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine.
0900c1528008f125.jpgFig. 1: View of the Engine Coolant Temperature (ECT) sensor 0900c1528008f126.jpgFig. 2: Engine Coolant Temperature (ECT) sensor locationTESTING
See Figures 3 and 4
  1. Remove the ECT sensor from the vehicle.
  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 engine coolant sensor temperature vs. 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.
0900c1528008f120.jpgFig. 3: Intake Air Temperature (IAT) and Engine Coolant Temperature (ECT) sensor wiring diagram 0900c1528008f095.jpgFig. 4: ECT sensor temperature vs. resistance values

Oct 01, 2008 | 1993 GMC Sierra

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