For some reason my electric fan (one we see threw the grill) is possessed. Every time I crank up the crd the fan turns on at full blast even with a left over night cold engine and it just keeps on running and only stops when I turn off the engine. Funny thing is that in the summer in 95 degree weather it never turned on and I was even wondering if the fan worked… Now I can’t get the dam thing to shut off. It just keeps on running at fool blast.
I tried disconnecting the battery and left it to sit over night disconnected hoping it would fix the problem but its still the same. I’m afraid that if I leave it running it will just blow the motor of the fan or damage something else.
Would I be able to disconnect the fan or maybe pull a fuse out to stop it? Does this fan have anything to do with the AC? What is the purpose of this fan?

Help

_________________
Horse Power: How fast you hit a wall.
Torque: How much of the wall you take with you.

06 CRD
OME HD w/clevis top plate
JBA 4.5 UCAs
245/75/16r Goodyear Duratrax
Fumoto Valve, V6 ABM
Rock Lizard Super Skinks
Cobra 75 WX ST
ECO GDE tune, 2.5 straight piped
ProVent, Samcoed
Non F37ed TCM
DieHard P1

VMKJCRD,

Did you get this resolved?

_________________
2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

Do you have an EVIC? Does it display odd outdoor temperatures? This might happen if the engine thinks it's 110° outside. Could be a bad ambient temperature sensor.

You will want a properly functioning electric fan come summer. Mine was disconnected by a less than intelligent dealership while repairing a brake line (the passenger front brake line goes round by way of the bumper!). The result was no cold air using air conditioning at less than highway speeds.

_________________
2005 CRD Limited Flame Red w/ Renegade rock rails & light bar, AirLift 1000. 225/75R16 MT/R's on cheap black steel wheels, dual MOPAR subwoofers, Ipod kit & seat covers, Samco hoses - totaled and gone. 2008 WK Laredo 3.0L diesel - AirLift 1000, wife won't let me mess with it much. 2013 JK Sahara on order.

Well some how it fixed itself... pretty strange. I disconnected the battery for an hour again and unplugged the ECU just for the hell of it and when I plugged every thing back and connected the battery it was back to normal. I also checked to see if the AC was blowing cold air. Every thing is fine now.

_________________
Horse Power: How fast you hit a wall.
Torque: How much of the wall you take with you.

06 CRD
OME HD w/clevis top plate
JBA 4.5 UCAs
245/75/16r Goodyear Duratrax
Fumoto Valve, V6 ABM
Rock Lizard Super Skinks
Cobra 75 WX ST
ECO GDE tune, 2.5 straight piped
ProVent, Samcoed
Non F37ed TCM
DieHard P1

Still could be an ambient temperature sensor. I replaced one on the wife's Pontiac once. It was reading the outside temperature as too high so the automatic temperature control was freezing her out. I replaced the sensor only to find out that the vehicle was attempting to compensate for a sensor it knew was wacked. Now the outside temperature was too cold and it dutifully pumped out heat when it was 80° out. Disconnecting the battery for half an hour set it back to the mid range. If it comes back in a few weeks, consider replacing it.

_________________
2005 CRD Limited Flame Red w/ Renegade rock rails & light bar, AirLift 1000. 225/75R16 MT/R's on cheap black steel wheels, dual MOPAR subwoofers, Ipod kit & seat covers, Samco hoses - totaled and gone. 2008 WK Laredo 3.0L diesel - AirLift 1000, wife won't let me mess with it much. 2013 JK Sahara on order.

Is the electric fan supposed to operate without the use of the air conditioner?

Because mine has NEVER come on without the ac on.

_________________
06 CRD Limited. IMII, GDE TCM, Carter transfer pump, Upgraded oem primary, 2 micron secondary, 3 inch mandrel straight pipe.
Transgo shift kit, EHM, fcv butterfly removed, egr plated off. 19 3/8 solid flex fan, no electric fan, 10k lb aux trans cooler.
Frankenlift II, Mopar skids, allj's rails, 235/85 km2 on stock rims

My understanding is the electric fan will come on, if the engine fan can't provide enough air, as in hill climbing with a tow, or things like that. It will come on with the a/c in stop and go situations, I don't know if it turns off at highway speeds though.
When I've drove mine in the summer heat it was on with the a/c, and after stopping and turning the a/c off, and letting it cool down, it would cycle.

_________________
JEEP naked it adds color to your cheeks.