98 ZJ 5.9 overheating? - JeepForum.com
 
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post #1 of 6 Old 02-09-2009, 08:44 PM Thread Starter
Texas98ZJ
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98 ZJ 5.9 overheating?

All,
First post! Need a little assistance here, my 98 ZJ 5.9 was consistently running 225 with the fan beating itself to death; but the temp never went higher. I noticed the upper radiater hose was pretty easily squished in my hand, but the lower was stiff as a rock. I thought radiator! The radiator is original and now has 140k miles on it. I pulled the radiator and it was in BAD shape, so I replaced it; filled it and burped the system several times. The upper radiator hose is now hot, but still not very firm to the squeeze; and temps are running right at 210. Lower hose is much harder than the upper. Problem? I told a mechanic to put in a 180 while in San Antonio because I spent a TON of time stuck in traffic. To me that means I shouldn't go above 180. SO - BOTTOM LINE : should the upper radiator hose be stiff to the squeeze? Would a non-hard upper mean the tstat is stuck closed? I'm now in El Paso and for those of you who know - it gets HOT HOT HOT down here in the summer and I don't want to be overheating. TIA for any help!
Rob

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post #2 of 6 Old 02-09-2009, 10:49 PM
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water pump? my upper hose is kinda squishy also...i have a 180 T stat on mine with an electric fan and it stays around 195 in the summer...those 5.9's have the electric fan right..maybe the an is going bad?

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post #3 of 6 Old 02-09-2009, 11:39 PM
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If it's running at the 210 mark then that's about normal on a warm to hot day.

The fins on the pump might be worn down a bit do to cavitation. Especially if it's never been replaced.

When it's running though the upper hose should be tight. I'd try a new termostat first. Make sure you have a new cap too.

ZJ 98 5.9 LTD. Lots of mods. 7" T&T's Long Arm Lift ,BFG KM2"s,35X12.50x16's,4:56's, Vanco brake upgrade, M1intake,Holley52mmTB,MikeLeach Headers,, Arb'ed HP D30,Aussie Locked rear,Procomp MX6 Shocks,Arb front,RearTR bumpers,ECT.ECT.

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post #4 of 6 Old 02-09-2009, 11:46 PM
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the lower radiator hose is harder to squeeze because theres a spring like shape former that is stronger, takes more of a beating down there, the upper is squishy because its just the hose. but i would replace the tstat first simply because its around 5 bucks with a gasket....if its not it, it wasnt that expensive and you know its good...
if that doesnt solve your problem since you already replaced your old worn out radiator. i would def check your water pump.

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post #5 of 6 Old 02-10-2009, 12:21 AM
Colorado 5.9
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The spring is in the bottom hose because there is suction down there. If there was no spring, the hose would collaps tight.

ZJ 98 5.9 LTD. Lots of mods. 7" T&T's Long Arm Lift ,BFG KM2"s,35X12.50x16's,4:56's, Vanco brake upgrade, M1intake,Holley52mmTB,MikeLeach Headers,, Arb'ed HP D30,Aussie Locked rear,Procomp MX6 Shocks,Arb front,RearTR bumpers,ECT.ECT.

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post #6 of 6 Old 02-10-2009, 06:11 AM
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My 5.9 runs between 210 - 220. That is when the fan turns on and off. I am pretty sure that is normal... I hit a tree and wrecked my radiator. So i have a new rad. new hoses and stat(180).

Jeremiah
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