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Old November 19th, 2019, 09:00
ChipsXJ ChipsXJ is offline
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Join Date: Jan 2005
Location: Broken Arrow, OK
Posts: 155
Electric Fan

What other trouble shooting can I do......or is it the ECM?

2001 XJ 2 WD

Electric fan runs constantly due to previous owner wiring in a relay by the fuse box.

When this relay is disconnected the electric fan stops.

With the extra relay disconnected - disconnect the coolant sensor connector the electric fan will come on.

The relay in the PDC has been replaced. The fuse in the PDC has been checked and is good.

I am thinking it might be the ECM but do not want to replace that unless I am sure.

I just do not know what else to replace.

The temp sensor on the back of the engine ha no bearing, right?
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Old November 19th, 2019, 20:28
Be_creative_107 Be_creative_107 is offline
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Join Date: Nov 2019
Location: Nevada
Posts: 1
Re: Electric Fan

Here goes my first message ever on here lmao. Still trying to figure this site out.

Is it possible to ditch the relay and connect things back to original....?

Also that electric fan is triggered by the ac"SWITCH" turning on as well. so even if the ac is disconnected or just not working it doesnt affect the fan. it is only affected from the controls inside the cab, i learned this from my first 93 cherokee. hopefully this helps or makes sense.
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Old November 20th, 2019, 03:39
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Tim_MN Tim_MN is offline
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Join Date: Mar 2003
Location: Minneapolis, MN
Posts: 7,010
Re: Electric Fan

Normal stock e-fan operation for 2000-01 is that e-fan runs only when called for by the ECM, based upon engine temperature, usually at about 218*. If the e-fan runs when the wire plug is disconnected from the Coolant Temperature Sensor on the thermostat housing, everything is likely functioning normally as originally designed. The 00-01 ECM does not cycle the e-fan on/off/on/off when the A/C is selected.

1997-2001 only have one temperature sensor, the one located on the thermostat housing.

It sounds like when the extra PO installed relay is disconnected, everything is functioning normally.

Originally Posted by bimmerjeeper

People are dumbfounded when I tell them I know how to change the spark plugs on a car.

Last edited by Tim_MN; November 20th, 2019 at 03:42.
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Old November 20th, 2019, 14:03
bajabronco bajabronco is offline
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Join Date: Apr 2013
Location: los angeles, ca
Posts: 174
Re: Electric Fan

ChipsXJ, -as others have said, the electric fan in a 2000-2001 only turns on when the temp gets up to 218. What a lot of us do is wire in a switch to turn on the fan manually. I did the mod in my 2000XJ and it works great! - Here is the FAQ on it
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