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My coolant gauge is not working, wanted to know the location of the sensor to check it and the wires

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  • mark morris
    mark morris Dec 15, 2016

    2008 f250 6.4 diesel

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  • Cars & Trucks Master
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That won't do you any good , You need to hook up a scan tool to what the PCM - engine computer see's ! The coolant sensor is a input to the PCM , temp. info is sent to the instrument cluster via C.A.N . - controller area network a serial data communication network . If your not having any driveablity problems could be the gauge itself or a instrument cluster problem . How to Diagnose Controller Area Network CAN

Posted on Dec 15, 2016

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2002 dodge diesel Temperature gauge not working,have changed Coolant temperature sensor, still not working


possibly change the wrong unit
gauges work from a sender unit not a sensor
it is located next to the thermostat housing normally and has only 1 wire connection
they work by having power through the gauge to the sender through variable resistance that is affected by heat to ground
test disconnect the wire from the sender
turn on the ignition key , ground out the wire and the gauge should go straight to full hot
sensors on the other hand have more wires and relay the coolant temp to the ECM so that air/fuel ratios can be adjusted , and fans switched on as required

Oct 12, 2016 | Dodge Cars & Trucks

1 Answer

Where is a temp gauge sensor located on a 1999 Oldsmobile bravada?


Which one? There should be a sensor for the dash gauge (one wire) and a coolant temp sensor for the ECU (two wires) and also a sensor for the outside temp display (no idea where this last one is--I just open the window if I want to know). The first two should be on the intake manifold, near the thermostat housing.

Jul 10, 2015 | Oldsmobile Cars & Trucks

1 Answer

What is the sensor that sits next to (behind) the coolant temp sensor 2000 taurus


If you can tell me the color of the wires I can tell you for sure. Normally one sensor is for the gauge and the other is for the computer.

Jun 19, 2013 | 2000 Ford Taurus

3 Answers

Temperature guage intermittent


It could be the coolant temperature sensor, you'll need to find it, should be located either in the intake manifold or the block. You may need a manual to find this.

Other possibilities include a faulty gauge (the gauges in the cluster can wear out over time), or a sticking thermostat. Have the cooling system pressure tested to check for internal leaks. You may want to have the coolant flushed as well, it's likely it may not have been done due to low mileage.

2/5 of the hole range is totally normal temperature.

Hope helps.

Nov 07, 2010 | 2011 Mahindra Scorpio

1 Answer

My temperature gauge does not work. There is a good amount of heat coming out of the heaters so I know it's not thermostat related. I also checked all of my fuses and there fine. I think the problem may...


There are two coolant temp sensors one is for the ECM and the other is for the gauge. They should be located near the upper rad hose water outlet. Normally the one for the gauge is a single wire sensor. Disconnect it and turn the key on take a test light and check for voltage. If you have power it's a good possibility the sensor is no good. cost about 20.00

Nov 03, 2010 | 1999 Ford Explorer

1 Answer

The check enging light comes on then goes off. I foud out the code po118 engine coolant temp circut high input. is it the coolant temp sensor. if so how do I replace it. It is on a 2004 jetta tdi


According to Autozone.com:

Because ECT (engine coolant temperature) sensor procedures vary depending upon their location, first locate the part. You may need to partially drain the engine coolant to prevent coolant spillage.
  • Disconnect the negative battery cable.
  • Unplug the ECT.
  • Then, unscrew it.
  • Reverse the removal procedures to install the new part.
  • Connect the negative battery cable to the battery.



    Related Parts:
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Coolant Temperature Sensor printpage_icon.gif



0900c152801bfc38.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Remove the coolant temperature sensor
The coolant temperature gauge sensor is a temperature-variable resistor, or thermistor. As coolant temperature increases, the resistance of the sensor decreases or decreases, depending on the type of sensor.
A1 and A2 platforms use a different type of circuit that A3 vehicles. On A1 and A2 vehicles, the circuit is a "resistance to ground" type. A3 vehicles use a "variable voltage" type, where a voltage is supplied to the sensor. Because of the circuitry design on A3 vehicles, testing of the coolant temperature gauge is limited.
The engine coolant temperature gauge uses a heat sensitive sending unit to transmit an electrical signal to the gauge. The sending unit is a heat sensitive variable resistor that is located on or near to the cylinder head and threads into an engine coolant passage. The sensors are a Negative Temperature Coefficient (NTC) type. As the temperature increases, the electrical resistance of the sensor decreases. As the coolant temperature changes, so does the resistance of the sensor. The gauge is calibrated within the operating range of the sensor and interprets the resistance value to display the coolant temperature.
Beginning with model year 1994, the engine coolant gauge and the Engine Control Module (ECM) temperature sensors were combined into one sensor with 4 terminals. The basic operation remains the same in that their resistance decreases as the coolant temperature increases, however the actual resistance values of the 2 sensor circuits are different. The electrical connector of the 4-wire terminal sensor ( 1 and 2 ) is keyed to prevent improper connection of the sensor's electrical circuit.

0900c152801bfc39.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Beginning with model year 1994, the Engine Coolant Temperature Sensors combined the sensors for the ECM and the gauge into one sensor-1997 2.8L V6 sensor shown


0900c152801bfc3a.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. The electrical connector for the combined temperature sensors is keyed to avoid improperly connecting the sensor's wiring-1997 2.8L V6 connector shown

Oct 17, 2010 | 2004 Volkswagen Jetta

1 Answer

Temp. gauge reads high some times. but the motor really isnt hot


It sounds like the coolant temperature sensor is beginning to fail. It is highly unlikely that the in-dash gauge is a problem. The coolant temp sensor inputs to the computer affecting everything from radiator fan speed, engine fuel/air calibration and a variety of other parameters.

Be absolutely certain to "burp" every bubble of atmosphere from the coolant system too. Air bubbles have the amazing ability to prevent coolant flow and will cause all sorts of problems, especially if the bubble wants to hang around the temperature sensor location.

Normal operating temperature is going to be around 210 F.

Most Autozone, Advance locations will read engine problem codes at no charge, so drop by one of those locations and let them read the problem code.

My guess will be the coolant temperature sensor. Then have the problem code reset, remove all air from the coolant and let us know how this worked.

Mar 11, 2010 | 2004 Chevrolet Impala

1 Answer

Coolant wiring


Ensure you are checking the right sensor.
The coolant level sensor is usually located in the coolant resevoir. It generally performs a hi/lo monitor switch function.
The coolant temperature sensor is usually located on the motor (cylinder head or thereabouts). It is a variable resistor dependant on coolant temperature.
As a quick check to identify the sensor, with engine running, short the sensor to ground. If it's the temp gauge sensor the gauge will go max high. Open circuit connection = temp low.

Aug 01, 2009 | 1998 Pontiac Sunfire

1 Answer

Where is the coolant temperature sensor located on 2000 Altima?


THE SENSOR FOR THE GAUGE IS ON THE HOUSING THE UPPER RADIATOR HOSE ATTACHES TO.

May 07, 2009 | 2000 Nissan Altima

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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