A/C electronic coolant fan not working

Hi,

Here is some information about this and a video that shows how to test one using hot water. Basically, this is a negative thermal coefficient sensor. Meaning as temp of the coolant goes up, the resistance in the sensor decreases so if you are monitoring the voltage of the sensor as shown in the video it will decrease. As temperature goes down of the coolant the voltage will go up.

https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

https://youtu.be/ZX3lbi9yGuE

Let me know if you have questions. Thanks