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Unread 06-17-2011, 07:46 PM   #1
Davidmf302
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1994 ZJ 
 
Join Date: May 2011
Location: Azle, Tx
Posts: 4
94 Limited overheating

I've got a 94 JGC Limited 5.2 that has just started overheating last couple of days. I replaced the thermostat bout a week ago because I thought it had been sticking. It seems to want to run between 230-235 down the freeway with the a/c running and overheats in traffic. It has been over 100 degrees outside but still I know it shouldn't be running thus hot. By the way I'm not losing any fluid so I ruled out leaks or blown head gaskets.

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Unread 06-17-2011, 07:57 PM   #2
sebian
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1995 ZJ 
 
Join Date: Sep 2009
Location: Austin, TX
Posts: 1,241
Have you checked your fan clutch for proper operation? You could also have a partial clog in your cooling system (system flush/fill usually fixes that), or a defective cap on your radiator.
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1995 ZJ 5.2L V8 318. 220,000 miles and still rollin.

List of parts not replaced yet:
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Unread 06-17-2011, 08:01 PM   #3
Davidmf302
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1994 ZJ 
 
Join Date: May 2011
Location: Azle, Tx
Posts: 4
The fan seems to have plenty of resistance when I check it, but I only have when it's cold. As far as the radiator cap, I havnt noticed any leaks. It's gotten worse last couple of days as far as running hotter.
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Unread 06-17-2011, 08:47 PM   #4
zander21510
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1995 ZJ 
 
Join Date: Jun 2011
Location: Dallas, TX
Posts: 1,754
My ZJ in the Houston drought heat isn't faring very well...after a few minutes it goes to 190 and slowly climbs past 210 the longer I drive...though its not very hard driving. My cooling system is working fine, the intense heat and highway traffic was probably just too much for the system.
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1995 Jeep Grand Cherokee;
207,000 miles (2/6/14)

206k: 1/6/14;
205k: 12/21/13; 204k: 11/22/13; 203k: 10/8/13; 202k: 8/29/13; 201k: 7/15/13; 200k: 6/8/13; 199k: 5/10/13; 198k: 3/17/13; 197k: 2/22/13;
196k: 12/20/12; 195k: 10/26/12; 194k: 8/17/12; 193k: 5/29/12; 192k: 3/16/12; 191k: 2/18/12;
190k: 12/31/11

Current mods: 703 injectors(my howto), intake modification, 99+ intake manifold (my howto), Magnaflow hi-flow cat from Kolak & Cherry Bomb glasspack.
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Unread 06-18-2011, 06:24 PM   #5
Midnightluckey
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1995 ZJ 
 
Join Date: May 2009
Location: Houston, TX, Tx
Posts: 1,223
Swap in a 160* stat. It allows the coolant to start flowing earlier and keep the system a little cooler.
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95 Limited Chargold ZJ 5.2L -5.5" lift (IRO, Ironman, and RC parts), 33" BFG M/T's, 15x8 procomp crawlers, 242 swap, 2 12" subs, 1000w amp, cherry bomb, full skid package, Kevins rear stealth bumper clone w 3/4" D rings, Rlcwelding front bumper w 3/8" D rings, XRC-8, front tow hooks, 2 daylighter fairlead lights, 2 daylighter windsheild lights, 2 55w driving lights, OBA, Cobra 18 CB, dual 4' whips, RC disconnects, smittybuilt jack, optima yellowtop.
Built not bought #512
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Unread 06-18-2011, 11:40 PM   #6
kattyaz
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1993 ZJ 
 
Join Date: Jun 2011
Location: Tucson, AZ
Posts: 1
We had the same problem with our 1993 for over a year. Just sitting at a drive through window for a few minutes would cause us to overheat and the AC would blow hot air. We just had the transmission rebuilt (this week) and they also replaced a seeping heater hose, the thermostat (and gasket) and flushed the cooling system and it seems to have resolved the issue (knock on wood)

I hope that this helps. Good luck!
Kathy
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