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Discussion Starter #1
I bought an '89 XJ for, you ain't gonna beleive this, $500. Paint sucks etc. otherwise great shape. Only problem is that it overheats. New thermostat, radiator flushed and new water pump, still overheats. I've heard that the closed system can get "bubbles" in it and causes the water pump to cativate. Any thoughts would be appreciated. Oh yeah, I'm building it up for my wife to wheel!!!! <IMG SRC="smilies/blender.gif" border="0">
 

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spray the engine side of the radiator. I went into a huge mud pit and the fan slung mud all over the back side so that no air could pass thru. Try that.
 

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Yep mine does the same thing. There is and artical in Cherokee [email protected] about the conversion. You can get a new gdi 3 core radiatior from 1-888-Radiator for $135. suppost to cure all of the problems.
 

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It could be air in the cooling system which needs to be "burped" out. However, I suspect the radiator is clogged with hard water deposits, which flushing won't even touch. I would take it to a radiator shop and have them take a look to see if it is indeed just clogged up with mineral deposits. If it is, they can take it apart, "rod it out" and then rebuild it to make it function like new. I've needed this done to two Jeeps and both times it cured an overheating problem.

If it's clogged and you have it rodded out, insist the radiator guys only use distilled or demineralized water to mix with the coolant or it will have hard water deposits again later.
 

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Try running w/out a t-stat and see what kind of results you get. I run the stock upcountry system in mine w/out a t-stat and it never sees anything near 210 unless it's sitting idle or crawling off-road.

Kinda sucks on cold north east mornings though, no heat for at least 30 minutes on the road, even then it's not too hot.
 

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Originally posted by Jerry Bransford:
<STRONG>It could be air in the cooling system which needs to be "burped" out. However, I suspect the radiator is clogged with hard water deposits, which flushing won't even touch. I would take it to a radiator shop and have them take a look to see if it is indeed just clogged up with mineral deposits. If it is, they can take it apart, "rod it out" and then rebuild it to make it function like new. I've needed this done to two Jeeps and both times it cured an overheating problem.

If it's clogged and you have it rodded out, insist the radiator guys only use distilled or demineralized water to mix with the coolant or it will have hard water deposits again later.</STRONG>

Exactly! Many higher mileage XJ's will clog the small radiators. Have it cleaned out and go from there. Be careful to get all of the air out. They can trap a large amount of air easily.
 

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Originally posted by Eddie Mcstiff:
<STRONG>Yep mine does the same thing. There is and artical in Cherokee [email protected] about the conversion. You can get a new gdi 3 core radiatior from 1-888-Radiator for $135. suppost to cure all of the problems.</STRONG>
Actually, you can get that GDI 3-core radiator for $99 from 1-888-Radiator.... <IMG SRC="smilies/wink.gif" border="0">
 

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<IMG SRC="smilies/biggrin.gif" border="0"> I also have an '89 that over heated. Like they posted above, do the GDI conversion
with a '91 or newer radiator and heater control valve. You'll also have to change the "burp" bottle (aftermarket at Kragens for $13), some 3/8" hose( 7')and a radiator cap. The new radiator doesn't have a "thermal bung" for the fan switch, you can either get an adjustable one from Flexilite or hard wire a toggle switch for it( the latter is what I did). Hope this helps ya!
<IMG SRC="smilies/bounce2.gif" border="0">
 

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Originally posted by Billy Badass: <STRONG> Actually, you can get that GDI 3-core radiator for $99 from 1-888-Radiator.... <IMG SRC="smilies/wink.gif" border="0"> </STRONG>
Actually I thought the NAXJA ect. deal had expired <IMG SRC="smilies/wink.gif" border="0"> NAXJA#264

[ 10-16-2001: Message edited by: Eddie Mcstiff ]
 

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Discussion Starter #10
Thanks, I think I'll try the new radiator upgrade. If there is a better way to cool this fawkin' thing then I'm all for it. Just for the hell of it, what was the goal of a "sealed" coolant system? All I've heard are problems. Every person I know that owns a Cherokee with this system has had some kind of problem. I've never had to deal with a system like this before so I'm a little curious. <IMG SRC="smilies/beer.gif" border="0">
 

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XJ's suck for cooling. I have a newer 97 and have had every known problem. Have 3 core GDI, new fan clutch, new rad cap, flowcooler, and thermostat.

Here is some wisdom that I have gained over the years.

Don't run without thermostat. You need the coolant to sit in the radiator for a time in order to cool off. Also don't try running a 165* stat, same problems. You don't want to keep the engine in an open loop as this will cause the engine to burn too rich and kill your gas milage and cat and O2 sensors. Keep the jeep in 195-215 range and you will be fine.

Change the fan clutch. It probably is past its prime and for $32, cheap insurance. You need to pull the rad to get the fan clutch out, so you may as well do it when you put the rad in.

GDI 3 core is a good deal.

Something as simple as a new rad cap (16#) will keep the coolant in the system and out of the overflow bottle.

Overflow bottles suck. Change over to the open system. Only issue (as addressed in earier post) is the temp sensor for the electric fan. Just sitck it somewhere out of the way of fans.

Even one moderate overheat (supposedly) will tweak your tstat. Cheap insurance is to replace that.

Keep burping that system. No easy way to do it, takes time when repacing the coolant. Believe it or not. I pulled the upper hose from the block dumped coolant and blew the air out with mouth. Did the trick and caught major shit from my friend (homophobe?)

Carry 5 gallon container of water with you whenever you wheel. You will thank me for this.

Beware of the fan clutch getting pushed into the rad. Inspect new fan clutch and file down any burrs that can rub rad b4 you install said clutch.

That;s it. Good luck

SeanP
 

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You must bleed the head on the older XJ's.

This is done by removing the screw on cap on the expansion tank on a cold engine. Then remove the coolant temp sending unit on the back drivers side of the head. This is a single wire sensor with a 1/2 inch hex head. Then fill the tank until coolant comes out of the hole. Replace the sensor, top off the coolant, replace the cap.

The difference between an air pocket in the head, and a plugged radiator is the engine will always overhead with an air pocket. It will only overhead going up hills with a stuffed radiator. You can service the radiator by removing the plug on the passenger side, and flushing it out through the upper hose.
 

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I had the same damn problem on my 89. I had the radiator checked out twice and it cooled for a little while, then the problems started up again. I finally just said fawk it and got the GDI 3 row. Not a single friggin' cooling problem since I popped that bad boy in. I can run 80mph at 3k RPMs in 95 degree weather all day with the AC on full blast without the needle so much as thinking of going past 195. At $99 shipped next day, it was a hell of a deal. Dameon at 1-888-radiator will hook you up with the good price if you tell him you are from NAXJA.
 

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My 95 Chero was having some problems overheating all the time. Even driving about a mile I could here the auxillary cooling fan kick in, it was rediculous! and everytime i stopped it would be boiling, and leaking anti-freeze. I replaced the waterpump Tuesday and everything has been perfect since then. no leaks, no overheating, nothin. <IMG SRC="smilies/biggrin.gif" border="0">
 
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