Okay first of all, I told you that disconnecting the sensor and the fans running is normal. It is supposed to work that way.
When you disconnect the sensor, The ECM sees no return voltage to the ECM and it will turn on the fans.
There is nothing wrong with that.
The light should have come on when the sensor was disconnected. That again is normal.
There is nothing wrong with the wiring as when the fans came on, that tested all the wiring to the fans.
You need either a new sensor or a thermostat as I stated 3 times.
Roy
Tuesday, April 14th, 2020 AT 3:14 AM