HOW TO TEST COOLANT TEMPERATURE SENSOR. Any Car

HOW TO TEST COOLANT TEMPERATURE SENSOR. Any Car

In this video we will demonstrate how to test coolant temperature sensor on any car. All you are going to need is thermometer and voltmeter to test the temperature sensor.
The coolant temperature sensor will show different om reading at different temperatures. We will include the graph in the video so you can use it to test your temperature sensor.
There is no need to replace a temperature sensor and waste your money when you can just test it for a few minutes and know for sure if it works or it does not.

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We, Auto Repair Guys, are not responsible for property damage or injury incurred as a result of any of the information contained in this video. Information given in this video does not guarantee the desired outcome. Any injury, damage or loss that may result from improper use of the tools, equipment, or the information contained in this video is the sole responsibility of the user and not Auto Repair Guys.

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[KrimsonApoLLo]

If you have a scan tool with the ability to read live data, an even easier way to test would be to get to the temperature reading on the scan tool and check the ECT (see if the temperature shown makes sense with how hot the engine should be). If it doesn't: check the ECT connector. When you unplug the connector the temperature on the scan tool should read around -40 F (completely open). Then jumper the two terminals on the connector (power to ground), this should give you a reading of around 250-284 F.

This completely tests the circuit of the ECT, completely ruling out any electrical issues. If your two numbers are within the specified ranges: your ECT sensor needs to be replaced. However, if at full open, you have a number significantly more than -40, or at short to power, you have a number significantly less than 250-284: you have an electrical issue.

[muirdewet]

4 year old video and still helped me so much today with my motobike! Thanks so much guys! 😁

[cecilsabourin]

Right on guy, no one is being as analitical and precise as you are . Thanks for this info

[orhannadiryamuk]

Thanks for definite tests. 160r for all time working fans.

[babelonchabalala]

Very straightforward and easy explained .... Thank you Sir

[marylamb]

I didn't put it in cold water but I did use the chart you have beside you, measured ambient temperature (temperature in the air), to get the proper ohm reading. The ohm reading can go from a few thousands to tens of thousands, depending on the ambient temperature, so you might need to adjust your ohm reader to reflect some high readings if necessary.

[johnguambo]

Temperature sensor is basically a resistant sensor.. the lower the temperature the higher the resistance, and the higher the temperature the lower the resistance. Once the temperature rise to 90 plus degrees resistance drops down to a certain point where it automatically triggers the fan relay actuators to activate the fan.

[richardbelley]

Very good instructions. Maybe you can answer the following. I am testing a brand new sensor out of the box. Can the sensor give a resistance reading at ambient temp in the air. I mean it is just out in the air at around 22 C. Will it follow the chart you have shown in your video? Thanks for the time you spend in making the videos.

[livvy]

Might be 4 years old but still Very Helpful - Thanks

[oeungmao]

I have a 97 BMW 328i, a reading at scan tool at all time for ECT is 141C/285F no mater its plug in or unplug. any idea ?

[TSmith-bmss]

Hi, thanks for video. Any can we re calibrate if the test fail or to many error reading.

[eastoaklandsartiebo-bo]

Do you have to take the sensor out to test it?

[massesbulet]

Camry 2000 v6 at 73F it's at 21.2 when scale is at 20k I am having hard starts in the morning is this resistance is good or it low

[ekisarodney]

Hey AutoRepairGuys,
I have a 2019 Ford Fiesta 1.0 Ecoboost Engine I noticed it has 2 temperature sensors, the one for coolant and for the cylinder head. I see the cylinder head sensor hanging and cant find where in the cylinder head to put it.

I bought this car used and I guess the previous owner thought it had an over heating issue but i notice the P1026 code was because of this sensor which works but is not in its place in the cylinder block.

Do you know where it plugs into the cylinder head?

[КирилДраганов-рд]

Hello, my car is a fiat bravo 2 2008 1.6 multijet diesel. Since I have it from the last summer the car does not have a stable idle. In the winter that problem was gone. This summer it is here again. I tried a lot of things but nothing is helping. Now I have error codes P01EA and P0487(for EGR). P01EA looks like very generic code but it looks like the ones for engine coolant problems. So I am thinking is it possible for a faulty coolant temperature sensor to cause an unstable idle when the car is warming and hot? For example, maybe the coolant temperature sensor is sending wrong information to the ECU that the car is still cold and the ECU is pushing the wrong air-fuel mixture as if the car is cold? Thanks in advance!

[robertmccully]

So where do you get the specs for all sensors?

[falconarcadegaming]

Uhhh my sensor is broken in half right after the plastic connector point before getting to the metal. Can I glue it back together?

[LuiNoTLS]

Hello.. I have a Ford fiesta edge 1.25 2012 model... The fan does not work when the temperature guage reaches 93c. I have tested the fan with 12v battery and it spins fine. I have bought genuine 70amp relay and 60amp fuse from Ford and still the fan won't work... Even when I turn the AC on, the fan won't still spin or work... Could this be a bad engine coolant temperature sensor? I look forward to hearing from u.. Regards

[dzBOXgaming]

So the sensor can give a faulty reading... When the car is cold (morning start) the scanner gives me a 0°c even the ambient temperature is about 18°c so it's not that cold and when running it barely hit the 60°c .... Before this issue the temperature was stable between 78 and 82 when running.
The question is it a faulty sensor or a problem with ECU