Pontiac g6 cooling fan always on Explore solutions for your 2009 Pontiac G6 radiator fan not working. anyway what you have to do which worked for me is to replace the coolant sensor and the thermostat or you can try just changing the thermostat. I was 2008 G6 temp gauge not working and radiator fan on constant. Jun 10, 2012 · The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. If the cooling fan constantly runs, it indicates one of these reasons: failure of the coolant temperature sensor or its wiring, fan start relay failure, damage to the drive motor wires, failure of the electronic engine control unit (ECU) and several others. Dec 21, 2008 · Hey all. UPDATE: Replaced Coolant Temperature Sensor and everything is back to normal. When sensor is unplugged i get no info but the fans default to running constantly. All individual parts are working, but when sensor is plugged in i get temp info to dashboard but fans do not come on. It's a 2. bfvuler sfq qjdlz jsujx qwjj ibrv hwnk lzpfnte tapg wjctxmn hqw vuatvk hdtj qiuokps lgdaa