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Unread 05-13-2013, 08:41 PM   #1
Desertrat357
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1988 XJ Cherokee 
 
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Typical overheating issues

Well, I don't known if it is because the engine compartment is too small, or the radiator/cooling system is not large enough. But on my new Cherokee which is my 3rd now, it is overheating. While cruising at 65 mph or even around town stop and go there is enough ram air flow to keep it at operating temperatures. However as soon as I am tooling down a two track or wheelin in four low the temp immediately climbs to about 225-230 degrees. So I was hoping to get ideas from your guys fixes. I am planning on wiring an inboard dash switch for electric fan, but what's the best way for that? Is there an aftermarket electric fan available? Can't wait to hear back guys

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Unread 05-13-2013, 10:10 PM   #2
sadoon
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Try and fix electrical fans

I fix it on my jeep the temp at 160 -170 F

Im using Subaru fans
Mercedes benz sensor at 85 C
Bosch relly
Fans run when u start the AC at hi speed and at 85 C with switch under dashboard for starting all time
image-1720156084.jpg   image-1578826144.jpg   image-2866892422.jpg   image-2447386368.jpg  

Last edited by sadoon; 05-13-2013 at 10:24 PM..
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Unread 05-13-2013, 11:28 PM   #3
chris87xj
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It sounds to me like your fan clutch is worn out and no longer locks up.
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Unread 05-14-2013, 10:09 AM   #4
Desertrat357
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Chris87xj. Is thee a way to test the fan clutch for proper lock-up? I've never known a good way to determine if the clutch is working or not. Thanks
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Unread 05-14-2013, 09:02 PM   #5
chris87xj
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With the engine cold and off, you should be able to rotate the fan blades by hand fairly easily. When the engine hot and off, you should feel noticeably more or even strong resistance to manually rotating the blades.
I'm not much impressed with the longevity of stock fan clutches.
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Unread 05-15-2013, 08:43 AM   #6
Desertrat357
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Sounds good, ill try it out this weekend. Is there an aftermarket fan clutch? Or are we stuck with the crappy OE clutches. I appreciate your help.
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Unread 05-15-2013, 10:35 AM   #7
dirtyracer
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i had a this same problem and found that years of driving off road in tall grass had built up a bunch of grass seeds and crab between the a.c. condenser and the radiator i removed the radiator and cleaned it out and it instantly fixed all my problems you might take a look at yours if so it will b a cheap fix
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Unread 05-15-2013, 08:17 PM   #8
djb383
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Quote:
Originally Posted by Desertrat357 View Post
Well, I don't known if it is because the engine compartment is too small, or the radiator/cooling system is not large enough. But on my new Cherokee which is my 3rd now, it is overheating........
The engine compartment and cooling system r the same size now as they were way back when, no? Way back when (things were new and the same size as they r now), it probably didn't overheat. Maybe typical owner neglect has taken it's toll over the years since new and causing overheating, no?
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Unread 05-15-2013, 09:25 PM   #9
Desertrat357
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Of course the newer Cherokees and older Cherokees and all Cherokees have the same size engine compartment. I was referring to, say a jeep wrangler, or grand Cherokee with the 4.0 liter engine. My observations are they both have much more room under the hood, perhaps more ram air cooling, no? Also instead of having a very short and wide radiator like the XJs it is more of a square shape which perhaps help with cooling. I was just making the observation as to why YJs TJs ZJs and WJs seam to not have overheating problems. Where as the XJ it is inherent. As far as the owner abuse, that is always a possibility since I don't know how the previous owner drove. But as far as i can tell its been well taken care of. New radiator. The waterpump is working, and the T-stat opens at the proper temperature.
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Unread 05-15-2013, 09:38 PM   #10
mike94yj
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I just replaced my electric fan. It was working but intermittent. Then notices it was running slow.. replaced it and my issues have gone way.
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Unread 05-15-2013, 10:03 PM   #11
djb383
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Every old car forum on the net has overheating threads......usually due to owner neglect/poor maintenance, not engine compartment or cooling system size/design.
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Unread 05-15-2013, 10:10 PM   #12
chris87xj
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Quote:
Originally Posted by Desertrat357 View Post
Sounds good, ill try it out this weekend. Is there an aftermarket fan clutch? Or are we stuck with the crappy OE clutches. I appreciate your help.
XJ cooling systems were unfortunately designed more along the needs of grocery getting than wheeling, so in a factory state are probably barely adequate for extreme duty use and can't tolerate any decrease in functionality for those conditions.
Hayden makes some good aftermarket fan clutches for a variety of needs. Since the fan itself makes an audible whirring noise when locked-up, people that don't subject their XJs to extreme duties often prefer softer duty fan clutches due to the decreased noise resulting and less engine power going to the fan.
Here's some good info: Hayden fan clutches
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Unread 05-15-2013, 10:49 PM   #13
Desertrat357
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Chris87xj, thanks for the input. Ill check Hayden products out.
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