Jeep overheating regularly because auxileray fan not kicking on is there a fix for this. if so please tell me how to do it I am a mechanic but have limited tools and this is my first jeep i want it running well and reliably.

 

x2 same issue right now , i think it is possible a fan motor issue , think i might need a complete new fan assembly

 

Straight wire it to the batery to see if its the fan motor

 

With the jeep running, unplug the coolant sensor on the thermostat housing and the fan should kick on and give a CEL.

Fan should kick in with AC on too.

If not, my guess is the fan is bad.

 

Um........basics boys. Lets start at wiring. Do you see any damage. Lets now move to does the fan even work. Hook her up to 12 volts. Does the fan turn on? Niw lets move to fuses.

I'd be extremely happy to follow up after you answer those questions with fact not guesses

 

OK, I've check the fan directly to the battery and it works fine. I would squeeze the relay/fuse together and it would kick on.

So I replaced the relay switch and nothing, won't kick on at all.

Now what?

 

From Joe Peters and well stated. Sounds harsh but just makes sense:

"Let’s play a game.

You pretend that you are the only one that knows what year/engine/model, etc that you are asking about.

We will all pretend you never asked a question until you provide at least the bare minimum of information about your vehicle".

 

Thanks for making me laugh.. with that "lets play a game"

ok, try this first. turn your AC on and see if the fan is on. It should be. If its not, I would look at fuses then if ok, Bypassing the relay. At that point, it can go many directions if it work or doesn't work. I need year of xj to go further. The older model had a totally independent system for the fan. the OBDII era have the fan turned on by the PCM. (don't like that one as much).

 

"let's play a game"..... That's funny!!!!!

My bad though, I have a 94 xj 4.0 std tranny

 

Look into wiring the fan to a switch. I was having the same problem as you in my 98 and I found out my fan was toast. After throwing a new one in I wired it right up to a switch so I could keep it going on those hot days on the rocks. However, my ecu didn't like it and threw me a fan relay code, I guess they're hit and miss so you might be okay with a '94. Just something to look into. Here's a link if you're interested.
https://www.cherokeeforum.com/f51/el...switch-132465/
Or this one, which is a little more complicated but a better setup
http://www.naxja.org/forum/showthread.php?t=1025399

 

OK, fan kicks on when I turn the A/C on. But not when motor gets hot.

And I know it is summer time (A/C time) but my A/C doesn't work.

How can I fix the problem without running a switch?

 

I think the switch for the fan is in the thermostat housing.

 

It is.

 

The temperature sensor is in the thermostat housing but the PCM also uses that sensor to calculate fuel ratio.
The fan is turned on and off by the PCM.

I have never heard mine starting because of engine heat. Not to sure what temp its supose to start at but if you want to switch it and keep the computer happy, its very easy.
Common relays have a Normaly open switch and a Normaly closed switch.
Just run the power to the fan true the Normaly closed switch and when your relay is turned on (by your inboard switch) it will take battery power going to the relay's normally open side and send it to the fan. The engine code may come on when the switch is on but will go away as soon as you switch it back to normal.
I can send a drawing on request. Very simple...

 

My 2000 does not turn on with the A/C. It turn on at 218 degrees, and the PCM turns it on occasionally when the A/C is running, but there is no rhyme or reason that I can tell why or when it comes on with regard to the A/C running. I wired a switch with a relay directly from the battery so I can run it when i am wheeling or when its extremely hot and I'm in traffic. This method works great and if I forget to turn it off when I get out, I hear it running to remind me. I would have powered the relay with an ignition only power source, but I like to leave the fan running when I shut the Jeep off on hot days when I'll be starting it again soon.