awork

I have a 97 Jeep Cherokee Sport with the 4.0. Here recently i had issues with my electric fan randomly turning on when the jeep has been off for hours. I replaced the relay, hoping that would fix it but it has not. I can move the relay a little and it stops but i think it is just because its coming unplugged.
Does it sound like i need to replace the fan or is there another possible issue?
Thanks

Here is my jeep.

NM-XJ

There is some good discussion here: https://www.cherokeeforum.com/f2/aux...im-lost-97314/

Check your temp sending unit and further test your relay.

Good looking rig, I have a soft spot for white with black grille...here's my machine:

BlueRidgeMark

If your fan is coming on when it is supplied with electricity, it's working properly, isn't it? That's what fans are supposed to do, right? Why would you consider replacing a properly working fan? Stop guessing, start thinking.

The problem is not the fan, the problem is that it is being switched on when it should not. The fan isn't switching the voltage. Something upstream of the fan is doing that.


If it stops when you wiggle the relay, start there. That should not happen. It's possible you have a bad relay socket and it is randomly grounding out, thus triggering the fan. A wiggly socket means START THERE.


Also possibly a bad relay.

They are cheap enough. If the socket isn't wiggly, try replacing the relay and see what happens.

MsMassakre

OP CLEARLY stated he already replaced the relay, didn't he? I'd start with actually trying to pay attention to what's written.
Sorry Awork, he threw some shade on a question I had about my fan too. I am willing to bet the problem is with your fuse block itself. Try taking it apart and checking for possible corrosion underneath

awork

Well I believe there reason I asked on the forum was to brain storm with people before actually replacing things that don't need replaced. Like I stated in my original post, I have already replaced the relay for the fan. I can do a lot of work on my own but when it comes to electrical issues I have limited experience.

awork

Oh I understand. There seems to be a lot of people that like to do that on here...


Thanks for the advice, I will try to do that this weekend. Hopefully it is something easy like that. I have already had to deal with a couple electrical gremlins!

MsMassakre

No problem, hope it works out for ya.

BlueRidgeMark

That's a weird idea! All wrong. Waaaaay wrong! You are supposed to randomly replace at least $50 worth of parts before doing any troubleshooting or checking!



Sorry, I missed that.


Which is why I pointed out the thought process - to help you think it through. The fan can't turn itself on, so the fan coming on randomly can't be fixed by replacing the fan. So, look at the components that turn on the fan. That would include the relay (which can be affected by the relay socket), some sensors, and the ECM.

Here's a site that does an excellent job of explaining relays in particular, and 12v circuits in general:

http://www.the12volt.com/

Turbo X_J

Has this vehicle ever been flooded, water leaks?