Question about 1998 Plymouth Neon

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Radiator fans remain on constantly running down the battery...

Is there a sensor that regulates the temp and thusly the fan operation?

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The one your after could be in fuse panel behind battery under hood! it shows in the lid when you open it you will see diagram

Posted on Jan 14, 2009

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I have a 96 Buick skylark.its overheating and I just replaced the thermostat and hose that runs from the radiator to the engine. But its still over heating.what can it be?


Bad water pump, blown head gasket, Clogged radiator, inside and out. If you constantly add coolant, head gasket. If not look to the radiator and pump.

Mar 20, 2016 | Buick Cars & Trucks

2 Answers

Put in new coolant temp sensor - fan still does not go on? Have to run the blower fan to keep engine cool. Question is would the Thermostat? have any effect on the Radiator fan?


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.

Mar 19, 2015 | Cars & Trucks

1 Answer

Car never reaches operating temperature (cold weather) thus little to no heat inside


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

Nov 25, 2012 | 2003 Hyundai Tiburon

2 Answers

Temp.gauge not working and the fan runs constant with poor fuel economy.


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.

Dec 06, 2010 | 2001 Chevrolet Impala

1 Answer

I have a 2004 jeep grand cherokee. when the car runs for a short time 5-10 min. the coolant fan turns on and does not shut down until the car is shut off. plenty of antifreeze. what is keeping the fan from...


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.

Aug 04, 2010 | Jeep Grand Cherokee Cars & Trucks

3 Answers

Radiator fans don't keeping running to keep the temp constant of the coolant


the fan only runs when the coolant temp reaches 225-230 degrees F, the temp will not remain constant, it will climb towards hot and then the fan will engage and bring it down, this is normal operation

May 17, 2010 | 1999 Pontiac Bonneville

1 Answer

Cooling system (radiator) fan won't turn off, car has not overheated. It does not turn off at a certain temperature it only turns off when my battery has finally had enough and died. We have unplugged it...


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.

Apr 22, 2010 | 1999 BMW 323 Series

1 Answer

My Caravan radiator fans run constantly and the temp gage never moves off "cold". The engine is not overheating. I have replaced the temp sensor and the thermostat. No change.


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.

Nov 10, 2009 | 1996 Dodge Caravan

4 Answers

Fans run constantly


check for a loose connection, could be on the a/c side.. maybe someone pull a wire to change a battery or something check around..

Feb 15, 2009 | 2001 Buick Regal

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