With the fan not being on, the jeep starts overheating it used to come on now it just doesn't at all.

any ideas? should i just replace the whole unit or is this a common problem.

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00wj Red genIII projector head lights, K&N CAI. (more coming soon!)

I replaced my fan motor and the relay under the passenger headlight and my fan works now.. On 90+ days tho it still will run at 220-230+... Not sure if this is normal, I hope I don't need to replace the radiator.
Anyway the relay is a common problem for going out so look into that I'd say

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-Michael-1999 Jeep Grand Cherokee WJ Laredo (oo\|||||||/oo) selec-trac 4x4. -She's gone
Now-2005 F-150 Fx4 scab, silver w/blk leather, '11 Fx4 badges, weathertech digital liners, white LED interior
Future-2.5" leveling kit, flowmaster dual exhaust, k&n intake, 5% tint, ptm handles/mirrors, Harley-Davidson headlights/tails, factory tow mirrors, kmc xd rockstars... :cool:
[SIGPIC][/SIGPIC]

I know with my xj (4.0), the fan stopped working and we were able to hook up the battery to the fan motor and determine that it was the thermostat that was busted. It's worth trying that first I'd say.

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www.facebook.com/stonecoldpaintwerks

just replaced the thermo and flushed the radiator so im gonna try the relaY and see where it goes

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00wj Red genIII projector head lights, K&N CAI. (more coming soon!)

I had a problem with mine not shutting off on my '01. Looked into it and it's a normal wear problem in which the fan either won't stop running or it won't run at all. It's the relay. I replaced it and it's been fine ever since.

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2001 Silverstone Metallic WJ Limited:
Gen III Clear/Chrome Projector/Halo/LEDs, 8K HIDs, Projector/Halo fogs, Clear/Chrome Tail Lights and 3rd Brake Light with LEDS, Diamond Mesh Upper and Lower Fascia, Spectre CAI, Breather Filter, Cabin Air Filter, Low-Temp Thermostat, Jet Stage 1 Chip, MagnaFlow Exhaust with Resonator Tip, Shorty Antenna, Front/Back De-badged

On the 04 i think it actually went to a relay (or relays hi lo? ) in the PDC, earlier vehicles uses a pcm controlled relay that is under the passanger headlamp. a dremel tool will clear the plastic out of the way in no time and I believe 2 8mm screws hold it in. VERY common failure... I have also seen some fans fail and kill the relay, actually most of the repairs in my memory right now had bad fans... The fan can be jumped directly to the battery to test, if it doesnt spin or struggles its bad. the relay has a power, ground, pcm control (to ground IIRC), and output to the fan, at the dealer I hook the DRBIII up and actuate the fan and verify I have all 4 of those at the relay, it would be tougher without actually being able to actuate it as you would need to warm the vehicle up and look for output. LIKELY its your relay, but it could very well be your fan too. and POSSIBLY it could be something else completely.

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I've heard peoples relays in these different places, mine is accessed via the rear of the fender well on the front passenger side of my '01 Limited

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2001 Silverstone Metallic WJ Limited:
Gen III Clear/Chrome Projector/Halo/LEDs, 8K HIDs, Projector/Halo fogs, Clear/Chrome Tail Lights and 3rd Brake Light with LEDS, Diamond Mesh Upper and Lower Fascia, Spectre CAI, Breather Filter, Cabin Air Filter, Low-Temp Thermostat, Jet Stage 1 Chip, MagnaFlow Exhaust with Resonator Tip, Shorty Antenna, Front/Back De-badged