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Unread 05-22-2005, 03:23 PM   #1
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1993 YJ Wrangler 
Join Date: May 2004
Location: Sacramento, CA
Posts: 566
Over heating Jeep YJ 2.5L

I have a 93 yj 2.5L. It has a 4 inch lift, 30 inch tires(i know i need bigger ones) and thats about it. Recently the jeep has been getting hot when i go on the freeway and go around 60mph for 15 mins. If i go 55mph i can go forever. I got the notice in the mail to get the jeep smoged for registration. I had to get a new catalytic converter to get this done. Since getting the catalytic converter, my jeep has been overheating when ever i go down the road, whether it is 40mph or 55, it doesnt matter. I have checked the radiator and it has antifreeze and enough water, what else could be the problem? I am in the dark at the moment. THanks.

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Unread 05-22-2005, 03:37 PM   #2
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2004 KJ Liberty 
Join Date: Mar 2002
Location: Flanders
Posts: 709
could be many things, but all can be brought back to 2 sources: either your cooling system is not working like it should, or you engine is producing to mutch heat. i would start by checking if the fins of the radiator aren't covered with mutt, check the fan (the visco might be shot) and the thermostat is also a good starting point.
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Unread 05-22-2005, 05:22 PM   #3
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Thermostat is the best place to start. Make sure you are getting flow to the radiator too. Put your hand on the hoses after driving it for alittle bit. If they are warm you have flow if not you have a thermostat issue. I replaced mine because my engine was not getting hot (open). Replaced it now it gets to 190 and chills there most the time. I wheeled my 4 banger yesterday and ideled for probally 4 hours and not moving never got above 190. The guy with a Chevy 350 adn a 18" high flow fan overheated all day...
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Unread 05-22-2005, 06:15 PM   #4
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a good chance you need to rod out the radiator, its starting to get hot here in cali.
93, 4 bangin, gutless yj that is ready to crawl this summer.
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Unread 05-23-2005, 05:23 AM   #5
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1993 YJ Wrangler 
Join Date: Jan 2005
Location: Albuquerque, NM
Posts: 7,216
The stock 2.5 rad is a single core. Most all of the replacement rads for a YJ are two core, and are reasonably priced. I swapped mine for a two core (I had a 2.5 for 8 yrs) and never had probs afterword.
'93 YJ, '02 GM 4.3V6, SOA, dual ARB's, 8.8+D30(WarnHubs), 4.88s, 35" BFG KM2s, AX15, NP231+4:1+SYE+2LO, York OBA, Warn M8000.
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