Can't figure out overheating problem...

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09-01-2010, 11:21 AM

#31

98XJBlack

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Model: Cherokee

I found one at Auto Zone for $109 and I'll replace the fan clutch as well. Thanks for the helpful info!

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09-01-2010, 12:03 PM

#32

fantic238

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Year: 1988 limited

Model: Cherokee

Engine: 4.0 litre

Quote:

Originally Posted by CAEMI

Interesting stuff...but how do I know if there is air in my system and if that air is actually causing a problem? I have a '94 with an open system. I have always thought that, because the overflow bottle is not airtight, that was the "vent" for excess air or air that results from minor boiling of fluid from hotspots.

If you have fluid in the far uppest part of the block, that means you have fluid in the upper radiator hose, you don't have air trapped in it.
If you fill an overflow bottle when the engine is cold it will throw it out as soon as it becomes hot, the overflow bottle should be at minimum when cold and at max when hot. You can add fluid to reach the full level only WHEN THE ENGINE IS HOT.

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09-01-2010, 12:06 PM

#33

fantic238

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Year: 1988 limited

Model: Cherokee

Engine: 4.0 litre

Quote:

Originally Posted by djb383

Like I said in #17 burping a '98 is a non-issue, it burps its self as the engine goes thru its heat/cool cycles. The key is a properly functioning rad cap......it has a 2-way valve mechanism in the cap and both valves must work properly.

Exactly, the difference is in the valve, it has that little thingie with a ball at the end that stops the water from flowing back but not the air.

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09-01-2010, 12:29 PM

#34

fantic238

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Year: 1988 limited

Model: Cherokee

Engine: 4.0 litre

Quote:

Originally Posted by 98XJBlack

This is all really interesting stuff to me. I think my problem is just an old clogged radiator. Even though it has been flushed I think to much gunk has built up over time. I am going to install a new radiator this weekend and hopefully this will solve my problem, heck it can't hurt at all. So here is my next question....Where and what radiator should I buy? Nothing crazy expensive, just a solid replacement. Thanks in advance!

If you have the old style rad with the brass headers it can be serviced.
I have done it.
I unwelded one of the headers and used a wiper blade rod to push the crap through the tubes. 80% were clogged. You can't even imagine what came out: mud, leafs, dead bugs, a penny etc.
I enjoyed doing this. My radiator is 22 years old and it never overheated again after i did this.

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