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Unread 04-29-2013, 02:16 PM   #1
OldManTan
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1998 ZJ 
 
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Overheating woes..

Hey JF
Been searching a little and thought I'd ask for some insight from the forum members
98 5.2 v8 bone stock except the lift.

Temp gauge usually sits @ 210 all day, but the past couple weeks have been hell.
Almost reached the red area on the gauge and when I parked it, The upper radiator hose blew off the radiator from the heat/pressure. I replaced the thermostat and gasket assuming it may have been the culprit. Nothing changed. I took the thermostat out and drilled a small bleeder hole as I read on another thread. nothing changed.upper hose blew off again. The water pump seems to be fine and is not making any noise or leaking. Just wondering if you guys thought it's be wise to replace the radiator?
I haven't torn into it to check and see if it is possibly the original unit.
Anything else I should check? I know I will have to snag some t-bolt hose clamps to ditch the oem clamps. coolant level is fine and fluid is new since the last incident.

Any tips or thoughts would be greatly appreciated!
thanks in advance!

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Unread 04-29-2013, 02:23 PM   #2
zander21510
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Did you try flushing it? Sounds like there is a clog somewhere in the system.
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Unread 04-29-2013, 02:33 PM   #3
OldManTan
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Quote:
Originally Posted by zander21510 View Post
Did you try flushing it? Sounds like there is a clog somewhere in the system.
I did not flush it.
to be honest, figured everything blew out when the upper hose gave
good suggestion
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Unread 04-29-2013, 02:58 PM   #4
yamifj1200
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It would be a very good idea to look at the fluid inside the radiator. Is it clean, no oil or other trash. There is a chance that the water pump impeller could be damaged not pumping the coolant through the cooling system. Have you looked at the actual fins on the radiator. They could be partially blocked, by bugs and debris. Or the worst thing could be you have a leaking head gasket that's building up pressure inside the cooling system blowing the upper radiator hose off.. Hope its an easy fix for you...


Eric M
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Unread 04-29-2013, 03:02 PM   #5
OldManTan
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Quote:
Originally Posted by yamifj1200 View Post
It would be a very good idea to look at the fluid inside the radiator. Is it clean, no oil or other trash. There is a chance that the water pump impeller could be damaged not pumping the coolant through the cooling system. Have you looked at the actual fins on the radiator. They could be partially blocked, by bugs and debris. Or the worst thing could be you have a leaking head gasket that's building up pressure inside the cooling system blowing the upper radiator hose off.. Hope its an easy fix for you...


Eric M
hope not

I will be tearing the jeep down this weekend. Really hoping it's just an old clogged up radiator.

Was just really concerned because I don't have any of the symptoms of a bad water pump. noise/leaking.
thanks for the tips, please let me know if anyone has anything else I should check
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Unread 04-30-2013, 07:25 PM   #6
OldManTan
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Bad fan clutch cause overheating?
Spun the fan by hand while cold, zero resistance and never got tighter. Spun it after letting the engine warm up to around 200 degrees and shut of the engine. Spins SLIGHTLY more resistant but still spins freely until your arm gets tired.
Isnt therr supposed to be resistance? Can a shot fan clutch cause overheating while stopped and driving ?
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Unread 04-30-2013, 07:35 PM   #7
zander21510
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Quote:
Originally Posted by OldManTan View Post
Bad fan clutch cause overheating?
Spun the fan by hand while cold, zero resistance and never got tighter. Spun it after letting the engine warm up to around 200 degrees and shut of the engine. Spins SLIGHTLY more resistant but still spins freely until your arm gets tired.
Isnt therr supposed to be resistance? Can a shot fan clutch cause overheating while stopped and driving ?
That would probably be it. There should be no to slight resistance cold, heavy resistance when hot
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Unread 04-30-2013, 08:09 PM   #8
OldManTan
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Quote:
Originally Posted by zander21510 View Post
That would probably be it. There should be no to slight resistance cold, heavy resistance when hot
Drats, looks like i will be replacing a fan clutch haha
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Unread 04-30-2013, 08:37 PM   #9
zander21510
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Quote:
Originally Posted by OldManTan View Post

Drats, looks like i will be replacing a fan clutch haha
Problem is these days the only replacements are "heavy duty" type fan clutches that will roar louder than the standard fan...iirc there is somewhere online that says how you can alter the spring mechanism to make it not roar as loud...
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