My dealer/shop told me that they have to replace the coolant temp sensor if the bike over heats, but that seems like BS.
I design electronics and don't understand why someone would design a temperature sensing element that gets damaged if it gets hot.
What gets damaged in the CFmoto sensor because I just looked up a few temperature sensor semiconductors and they are fine to 155C, which is well over a rad's maximum temp, no?

So does anyone know if they real do need to change the coolant temp sensor if the rad over heats (oh, and it over heated because the fan died on my 2 yr old Cforce 600).
The worst part is they replaced the temp sensor and the new sensor was defective right from the start and CFmotot says that it's not covered under warranty - WTF!  Sorry, just very frustrated about this.
Thanks
  John

[2015 Z Force 800 53/Trail EPS]

2021 CF600- on yours it does look like the ECU uses input from the coolant temp sensor to provide either ground or power to the fan relay coil. It is very common for these sensors to fail and moreover, the acceptable failure rate for Chinese parts is much higher then with other manufacturers so it is also not unheard of for several to not work in a row. Others with older machines found this out with the old thermoswitches. But know it can also be a bad relay as well as well as a problem with the ECU or motor itself. Sense you had a problem with the motor I assume the fuse and connectors were all checked. High loads on Chinese connectors can be an issue.