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dryflakescalp
July 13th, 2005, 08:51
My '90 Cherokee Limited has been running hot. Changed the water pump, thermostat and flushed the system. Now I'm going to change the radiator, pressure bottle and the hoses. I'm also planning on replacing the fans. What's the right way to fill the system and since I have A/C, will I need a specific radiator?

Also, what are the signs for head gasket leaks? After running hot, but not into the red or overheating, I checked the oil and saw 2 small bubbles at the top of the dipstick. The bubbles looked like the oil was bubbling. Am I screwed?

Pugsley
July 13th, 2005, 09:59
I have a 90 cherokee also and it runs at 210 all the time. Im to am working on fixing the high temp problem, replaced the thermostat, water pump, hoses, expantion bottle. Im going to order a 3 row radiator from radiator.com for 187.12 to my door. My xj needs some motor work. I plan on replacing it with a rebuilt long block by the end of the year. my a/c dosn't work but I will keep it in place to fixed at a later date. All I know is XJ's rum hot no matter what, mine like to leave a wet spot where ever I park. I carry 4 gal of water to keep it cool when it needs it. Since I replace the expantion bottle no more wet spot but still runs hot.

As far as your oil problem Im not sure... sorry

Pugsley - My first post here

Yucca-Man
July 13th, 2005, 10:49
I have a 90 cherokee also and it runs at 210 all the time. Im to am working on fixing the high temp problemWhat problem? Allow me to refresh the collective memory on this board...

210 is NORMAL operating temperature for the 4.0L! ! ! !

8Mud
July 13th, 2005, 11:02
What problem? Allow me to refresh the collective memory on this board...

210 is NORMAL operating temperature for the 4.0L! ! ! !

Mine runs at a hundred :laugh3:

If you have to be constantly adding water, do yourself a favor and buy a big jug of budget distilled water and second best rain water.
The stuff in the water, falls out of suspension when it gets hot and usually ends up in the bottom of your radiator. Might take awhile, but every quart of tap water adds to it some, until itīs mostly plugged up.

Yucca-Man
July 13th, 2005, 11:07
Fargin' metric smartalecks...http://www.yuccaman.com/icons/happyfinger.gif

slowrider
July 13th, 2005, 12:21
If you're replacing the whole cooling system you may want to consider getting away from the early closed cooling system. The newer system is easier to fill, burps itself and has a cap directly on the radiator. I did this to my 87 mj and it works great.

dryflakescalp
July 13th, 2005, 12:45
If I switch to a new system, do I need adaptors or would it fit right in? Are there any computer issues with doing this?

slowrider
July 13th, 2005, 13:12
Everything dropped right in for me but I don't have AC or an E fan. There is a good write up for the conversion on madxj.com.

Pugsley
July 13th, 2005, 15:20
just to refresh your memory

"All I know is XJ's rum hot no matter what, mine likes to leave a wet spot where ever I park. I carry 4 gal of water to keep it cool when it needs it"

Yukaman: I know 210 is normal, leaving wet spots isn't. Thanks for the loud reminder.

Maybe I could have worded it better but thats what I wrote.

Thanks,

Pugsley

Rev Den
July 13th, 2005, 15:54
Yukaman: I know 210 is normal, leaving wet spots isn't. Thanks for the loud reminder.

BUT, you also said...

Since I replace the expantion bottle no more wet spot but still runs hot

So....I guess its fixed now?

BTW-The closed system will function just fine when maintained, just a little bit. There is NO REASON to swap to an "open" system.

HTH

Rev

Pugsley
July 13th, 2005, 16:00
OK, you got me

but it's only been 2 days since the last fixes. and I had to add more water to it this morning.

Glad Im making new friends here, HAHA

Thanks, Pugsley

red91
July 13th, 2005, 16:01
What problem? Allow me to refresh the collective memory on this board...

210 is NORMAL operating temperature for the 4.0L! ! ! !



GOT STICKEY ???

casm
July 13th, 2005, 16:10
Glad Im making new friends here, HAHA

Yeah, impressive for only three posts.

Getting back to the problem at hand, have you tried bleeding the cooling system? You may have trapped air in it that's slowly making its way into the overfllow bottle, hence the overheating and need for fresh water every couple of days.

Pugsley
July 13th, 2005, 18:35
I have forced water in with a water hose and still. Matter of fact I did that the day I made the changes... Hmmm

Just check it after a a short trip and all the water is still there.


Thanks ,

Pugsley

bjoehandley
July 13th, 2005, 21:09
Dad took a modified blowgun and blew all the junk out of the fins on his '90, went to a 185* t-stat and a new water pump. Now the truck won't even get to 200* on a hot day!

churky89
July 14th, 2005, 01:01
Does anybody know what thenormal operating temp is for the 4.0?? :laugh3: :laugh3:

dryflakescalp
July 14th, 2005, 09:30
Dad took a modified blowgun and blew all the junk out of the fins on his '90, went to a 185* t-stat and a new water pump. Now the truck won't even get to 200* on a hot day!
If I did that, my fins would fall out...stupid lousy Northeast weather...

Thanks for the input. Radiator.com is trying to talk me into a GDI 3 core instead of a Modine 2 core, but it seems like a 2 core is what everyone recomends.

3XJFamily
July 14th, 2005, 15:47
Radiator.com is trying to talk me into a GDI 3 core instead of a Modine 2 core, but it seems like a 2 core is what everyone recomends.

I got the GDI 3 core from them. . . Wish I had got the Modine 2 core...

bjoehandley
July 14th, 2005, 21:37
What's wrong with the GDI 3 row? I just bought one to put in my '98.

Pugsley
July 14th, 2005, 23:00
the guy at Radiator.com told me that GDI bought Modine. so it would be the same one. I want more cooling surface so I'm opting for the 3 row not 2.

Thanks,

Pugsley

Yucca-Man
July 14th, 2005, 23:37
I have forced water in with a water hose and still.Water hose...hmm...that doesn't exactly cause me to think you've got a handle on the overheating problem for a couple reasons. If you always use a garden hose to fill your radiator, you very likely have mineral deposits in the radiator that are restricting coolant flow and cooling ability. Use only distilled water. Additionally, a garden hose could very easily have suspended air bubbles in it, or the act of filling could ssupend some bubbles so you aren't helping matters. If you are using a hose to fill it, how is your antifreeze diluted and added?

You say you leave puddles/leaks/whatever. Where is the liquid coming from? Trace it back to the source! If it's from the nose of the water pump, replace the pump ASAP - that may even help some of the heating issues.

What IS "hot" to you?- you keep saying it's running hot, yet give no figures that actually provide information.

Pugsley
July 15th, 2005, 00:20
OK,
First things first. This isn't the greatest XJ I have ever layed eyes on.
I got it used from a vollenter fire dept. Dirt cheap. It will over heat ( spew water everwhere) if it revs over 3000 rpms( bad expation bottle now fixed) . when I got it home the first day it blew the lower rad hase.
I did at first put anti freeze in it, but I had to put water in it every other day. this XJ has been running on the edge of life for the last year. This fall I plan to fix the XJ or get a new to me used 4x4.

I have been working on keeping it running this summer but its getting bad.
It needs a motor rebuild ( has blow by ), raditator, a/c doen't work, seals in seering box looked like they were leaking today, seals in axles, electical rewiring, and the suspention is sagging, rotted, and just bad.

What I have replaced - t-stat, water pump, expantion bottle, all radiator hoses, battery, positive & negitive cables, power steering pump, brakes drums & roters, rebuilt slaves.

So back on trac Hot to me is when it spews water from the old expantion bottle.
the reason I used tap water was it was a gallon every 2 days and I was waiting to fix it all then get the antifreeze in the system back in.

After I get the new radiator I will put anti freeze in it with distiled water.

Then in November I was thinking of replacing the motor.

Thanks ,


Pugsley