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On some vehicles the coolant temp sensor is separate from the radiator fan switch - there are actually two sensors. We would need to know the manufacturer, year, make, and engine size to make better determination of the cause of your problem.
change the thermostat, sounds like it could stuck open and wont allow the engine reach operating temp, also test the constant control relay module located to the right of the battery as your facing the front of the car, also test coolant temp switch it might be defective and producing a high voltage that would cause the fans to constantly operate no matter the temp. Hope this helps
The most likely cause is due to the radiator fan constantly running and the engine not getting to operating temperature, thats why your temp gauge isnt going up, check all related wiring to the cooling fan and make sure there no bare wires that could be causing a short to ground causing the fan to constantly run, secondly check the fan relay, if all of that checks out check the coolant temperature sensor because the information from that sensor tells the computer when to turn the fan on and off, if the sensor is bad it could be telling the computer the engine is hot when in fact its not.
Sounds like you may either have a thermostat that is not fully opening or a radiator that is partially obstructed (externally or internally). If I'm correct, what may be happening is that when the engine reaches operating temperature, it is continuing to get hotter but at the point you are at, the fans are able to compensate by remaining on. Only other possibility is that the temp sender is bad and sending incorrect info to the computer, causing it to turn the fan on. The concentration of antifreeze in a system does not change the operating temp. What it does is prevent the coolant from boiling at a temperature above what plain water would. Your radiator cap also helps with that as a liquid under pressure will boil at a higher temp. Proper concentration is 50/50. Normal operating temp is about 210 degrees(f). (+ ) (- ) 5 degrees) So, I'd test the coolant sensor and replace the thermostat. Hopefully the radiator won't need to come out but you may need to have it checked if neither other options work.
This is most likely due to a faulty temp sensor which screws into the radiator. Once this cools down it should open the circuit and allow the relay to open as well. If the sensor is constantly closed it will close the relay and keep the fan on thus draining the battery. I would replace the relay and sensor assembly due to high heat while these systems are running. The sensor should be nearest the fill neck on the radiator. Let me know if you need anything else.
The temperature sensor may be controlling the fan via a relay; these can fail by welding the contacts together remaining permanently 'on.'
Locate the fuse (and possibly relay) box, check inside the cover for a layout that identifies which fuse or relay controls the fan; they are often on their own fuse and definitely on their own relay.