i just became the proud owner of a 93 cherokee that likes to run hot at idle. fan does not kick on to cool down need advice to check if fan is bad or if there is another issue out there?

 

Hook your fan up directly to your battery and see if it runs,if it does you will need to look at the sensor on the tstat housing,check your a/c to see if it is charged,and check fan relay. Make sure your fan is good first.

 

When you say HOT..how hot.
What is HOT to a 4.0L is very different than a HOT for other cars/trucks

The OEM electric cooling fan will not kick in until well over 210* (or "straight-up")
I do not know the exact temp. Maybe someone in-the-know can chime in here on that.

MOST XJ's tend to hang around 210*

Mine in patricular doesn't. I have my electric fan wiried into the oem defroster switch (Defroster grid wire came off glass--so it doesn't work).
I kept the original wiring hooked up, I just piggy-backed a wire to the + lead and up to the defrost switch.
Now when it seems like its a tad bit hot, I hit the switch. It stays active for up to 8-9min. then shuts off. Also, the light illuminates so, I can tell when the fan is active. Even if I haven't activated the switch...like when the comp starts it or if A/C has been kicked.

https://www.cherokeeforum.com/showth...ghlight=howler

 

thanks for the info.
ordered new ecm, turns out they forgot the fan switch. put in orginal that throws code and fan works in a/c mode but doesn't kick in till about 230-240. re-ordered ecm. keeping fingers crossed.

 

Can you tell me what ecm means. not quite sure but I love the idear about rewireing the efan to the defrost.

 

Ecm (electronic control modual)

 

also have other trix i have used in the overheat battle of the 4.0....need them just get back with me ! good luck

 

thanks,
i may need them, but the computer is due in tues. and hoping that will solve issue. just found out got a cracked exhaust manifold too. don't know if repairing is going to lower temp. is it worth fix'n?

 

i'm finding out its true on this one- JEEP: Just Empty Every Pocket. i've got a 79 cj7 with a 304 3 speed so i kinda knew what i was in for.