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2004 jeep wrangler overheats when in traffic or idling. Noticed radiator fan not turning but spins easily by hand. Why would fan not be running

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If that fan is on the engine, then it's likely the clutch. If it's electric, you'll have to check fuses, relays, and sensor in the coolant line.

Posted on Apr 17, 2017

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Replace the fan. Fan motor is more than likely fried.

Posted on Apr 17, 2017

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It's a clutch type that is past it's use by date.
Replace it or risk an engine

Posted on Apr 17, 2017

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Posted on Jan 02, 2017

ford_67
  • 34 Answers

SOURCE: just replaced the water pump,

Check to see if the thermostat is installed correctly there is a certain way it goes the cooling system. Since you have had a lot of parts replaced could have air trapped in system this can cause overheating as well. Drain radiator leave cap of and start motor add water slowly until radiator is at the level recommended. Does car have white smoke comming out exhuast pipe this would be good indication of a blown head gasket. Hope this helps

Posted on Aug 23, 2008

  • 4 Answers

SOURCE: 2004 Jeep wrangler 4.0 - 6cyl overheating

I had the same overheating problem in my jeep ! My problem was finaly found out to be the clutch in my fan its a different kind of clutch system it work as this. When your jeep gets warmer the tighter your fan clutch gets .While cool your fan moves slowly. now to test your clutch just warm up your jeep and rev it up a bit if your fan dose not pick up speed then it is sliping.What will come out of this is that you fan will the seez and run full all the time. if you jeep dose not overheat wile moving then it is not your thermo stat period.

Posted on Oct 14, 2008

  • 1 Answer

SOURCE: Radiator Electric Fan Motor on a 2003 Buick Century won't come on when temp gets high

I have a 1997 Buick Century with the same problem. Both my fans work if the A/C is
on as they should. If your turn off the A/C the passanger side fan will not come on
and at an idle the coolant in the radiator will boil, you can hear it in the overflow tank.
If you are driving there is enough air flow thru the radiator that the coolant doesn't
boil and the car doesn't overheat. I have replace the water pump, the thermostat.
and the ETS or engine temperature sensor mounted just above the thermostat in
the thernostat housing, to no avail, I still have the same problem. The only other
thing is the coolant level sensor in the radiator, which I haven't replace yet due
to the fact you have to pull the radiator in order to replace it, which is a major
undertaking. I have a low coolant indicator on all the time on the dash so I have
a pretty good idea the coolanat level sensor is bad. The coolant level is not low
so that sensor is not working as it should. I hope this may help with your problem.
To test you fan raise the hood when it is cold and top off the radiator and fill the
overflow tank to the cold mark. Start the car and let it idle with the A/C off and
see if the drivers side fans comes on. It will have to get to operating temp
before the fan will come on. If it doesn't come on replace the radiator low coolant
sensor on the passanger side of the radiator. If that doesn't fix the problem
replace the thermostat and the Engine Temperature Sensor at the thermostat
housing with an A/C Delco Engine Temperature Sensor. Good Luck..

Posted on Nov 11, 2008

  • 1 Answer

SOURCE: My Jeep overheats while sitting idle. When I drive, the gauge goes down quickly. I have had thermostat and fan changed. I have also had the radiator flushed. What can it be?

we have a 2003 and it did the very same thing . Its called cooling fan relay it costs about 60.00 and is located behind the headlight assembly . not very hard to fix if you know anything about cars .

Posted on May 07, 2009

motor1258
  • 6674 Answers

SOURCE: radiator fan will not turn on and car overheats.

Check rad fan relay & or fuse under hood in fuse/relay box on drivers side fender area. Map is on underside of cover.

Posted on Jul 12, 2009

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2 Answers

I have removed the thermostart of my grand cherokee jeep 1996,i still experience temperature rising while i am in hold up or traffic but reduces as soon as i accelerate.


the thermostat was not the problem but the viscous fan hub ( fan clutch) is
while it is spinning , there is no drive action when idling ( as at lights , slow traffic , hills in low gear etc) and so it is not pulling air through the radiator when needed
your statement that the temp reduces as soon as you start moving means that with forward movement the air is flowing through the radiator and cooling the coolant

Jun 20, 2016 | Jeep Cars & Trucks

1 Answer

Engine overheating quickly


there are 2 or 3 fans up front on all A/C equipped cars.
the fan closed to engine (rad rear) turns on parked and idling
all engines will overheat parked, if the fan goes dead.
so are you saying this fan is dead.?
if it dont overheat moving fast then the cooling system is usually good
and then you stop at a traffic light this fan must turn on.
on cars with 3 fans , some stage up, 2 on if too hot. or all 3 on.
the FSM covers this logic clearly.
in the USA car.
the element has 2 fans (some engine options my differ)
the right fan is for A/C
and left fan is for engine cooling, (im looking at alldata.com to see that)

the fan turns on via a relay that he PCM controls
the PCM see the ECT sensor in the engine go to over say 225F and
it closes the relay, and the fan spins at full speed.

fuse 4 runs this relay, in the fuse box
the relay and fuse are named
radiator fan.

Mar 01, 2014 | 2004 Honda Element

1 Answer

My 1997 Jeep Wrangler overheated and I heard a clicking sound before it stopped. It started right back up and we determined it need a new radiator and we replaced the themostat while we were at it. Now its...


you could have bought a bad thermostat,it happens.the clutch on your fan could be going bad also.that would be my suggestion[bad clutch on fan] if @ when it gets hot again, shut it off and then try to spin fan by hand, if it spins easily, it's bad.in other words, the clutch on the fan is designed to kick in and spin like crazy when the engine heats up, you should even hear the difference in the sound of the motor.a whirring sound. i hope this helps you out!!!

Aug 23, 2010 | 1997 Jeep Wrangler

1 Answer

When idling my jeep overheats. The cooling fan is running and it speeds up when temperature goes up. The temperature gets close to 260 degrees and the engine tries to stall. when I start moving it cools...


At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.

Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.

If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?

It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.

Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.

Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..

The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.

Aug 14, 2010 | 2003 Jeep Grand Cherokee

3 Answers

My 2000 Jeep Grand Cherokee overheats in traffic


Check the fuse for the fan and use a test light to make sure that the circuit is functioning. Warm up your car then feel along the top and bottom of the radiator to check for cold spots. If you find any then you may need to replace your radiator. If your heater isn't currently working it may be that since it is a part of your cooling system.

Apr 29, 2010 | 2000 Jeep Grand Cherokee

1 Answer

It really does overheat a lot when in traffic.


You need to check youe water pump, thermostat and your radiator cap and if all of that is good it sounds like a blown headgasket.

Mar 08, 2010 | 1990 Toyota Corolla

3 Answers

I have 2003 grand cherokee with 140000 miles that overheats at idle. as soon as i start moving again, the temp goes back to normal.


You have two fan's on your truck, 1 is a fan clutch runs with the drive belt, 2 elec fan motor, with test light and engine running at normal temp, just a little bit above 1/2 way on your temp gauge check voltage at elec. cooling fan harness if you have voltage at one of the two wire's and fan don't turn on, bad cooling fan motor, on the fan clutch after you check voltage at elec. fan motor turn engine off, with your hand spin drive belt fan if it spin's freely bad fan clutch, replace it.Also check cooling level.Hope this was very helpful

Jan 21, 2010 | 2006 Jeep Commander

2 Answers

Fan doesn't work


change the Radiator Fan

Nov 01, 2008 | 2004 Jeep Grand Cherokee

3 Answers

2004 Jeep wrangler 4.0 - 6cyl overheating


I had the same overheating problem in my jeep ! My problem was finaly found out to be the clutch in my fan its a different kind of clutch system it work as this. When your jeep gets warmer the tighter your fan clutch gets .While cool your fan moves slowly. now to test your clutch just warm up your jeep and rev it up a bit if your fan dose not pick up speed then it is sliping.What will come out of this is that you fan will the seez and run full all the time. if you jeep dose not overheat wile moving then it is not your thermo stat period.

Sep 02, 2008 | 2004 Jeep Wrangler

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