2016 Silverado 5.3 fans staying on

[Rickyace09]

 

 so about 4 months ago I noticed my fans running and my temp gauge needle was all the way down as not registering or not warmed up. I parked the truck and noticed the fan was still running as I shut it off. I disconnected the battery terminal and they shut off. The next morning I started up the truck and it instantly did it again. I changed the temp sensor and it seemed to correct the issue until last night. The fans were running again. I bought the sensor from auto zone but was a ac Delco one. Should I be trying another option to fix this? I read change the thermostat instead cause it could be that rather the sensor. Please help. 

[Texasdeere]

It is most likely the thermostat.  Probably stuck open or partially open.  Temp gauge reading full low and fans on High is a default self protect mode of some kind.  I would disconnect the battery and change out the Thermostat.

[Rickyace09]

It was definitely the thermostat and what’s nuts since I bought the truck the temp always fluctuated I guess from air in it by not being bled correctly. It stays at 210 without movement now.