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Old 03-26-2014, 02:11 PM   #1
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Over heating issues please help!

I have a 2000 TJ 4.0 that has been running hot. When it first started I believed it to just be the thermostat so I replaced that and seemed fine for a day or so. Then it started acting up again only now it is leaking a small amount of coolant. I can't pinpoint exactly where from. The radiator was replaced in September and it's not leaking there. All the hoses seem to be fine. And the water pump seems to be circulating like it should. I know the 2000 year model are bad about heads. But the oil is perfect, not watery or milky. And I'm hoping it's not that. I've read a bunch or post on here. But can't seem to find any answers. So any suggestions would be greatly appreciated. Thanks

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Old 03-26-2014, 02:29 PM   #2
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Is it possible the coolant is leaking from the radiator cap? If your issues initially seemed to be fixed by the new thermostat, I would suspect your new thermostat is possibly bad; its not unusual. And maybe your coolant is coming through the cap because your t-stat is stuck closed, boiling up the small amount of coolant in the hoses/radiator. I had something very similar.

My suggestion is to replace your radiator cap and thermostat, and I suspect that will address your issues.

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Old 03-26-2014, 02:47 PM   #3
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I had this exact same problem a year ago
And I have a 01 tj 4.0
My problem was the fluid leaked from the drain plug
Just a drop every 5 seconds and as time went on it got faster then te plug broke and all of the fluid came out.
They replaced the radiator but put after market one it and it did it again .
So they changed te radiator to a different brand and it was fine

I would change the cap on yours
But if you end up replacing the radiator make sure you get the right one p
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Old 03-26-2014, 02:59 PM   #4
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Could be a faulty t-stat. What general area is it leaking from? Like is the water pump wet? Is it in the vicinity of the radiator? It's very common for the t-stat to shift in the housing when it's bolted back to the block causing a poor seal and leakage. I've seen it quite a few times.
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Old 03-26-2014, 07:53 PM   #5
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Bet your fan clutch is bad. Happened to my 2000 Sport about 2 summers ago. That won't be the cause of your leak though. Spend the extra money for a factory unit or at least a heavy duty aftermarket unit. I elected for HD aftermarket.
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Old 03-26-2014, 08:21 PM   #6
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You can put some dye in the coolant (they sell it at amazon its called DyeLite I think), and after wiping down the engine real good, drive a little bit. Use a cheap $15 black light from walmart in your garage to trace the source of the leak. Another option is just start swapping out things, you're going to need to eventually with a 12 year old Jeep. If you just did the radiator the water pump would probably be the next best thing.
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Old 03-29-2014, 12:20 AM   #7
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Sorry for the delayed reply. But Thanks for all the input. I'm starting in the morning and will check into all y'all's suggestions bc honestly it's had me stumped.
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Old 03-29-2014, 12:35 AM   #8
Knows a couple things...

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Leaks you can't find always make me think water pump...especially when it's overheating. If it's the water pump, go with a Mopar replacement and avoid the cheapie store brands like AutoZone sells.
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Old 03-29-2014, 01:08 AM   #9
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Jerry, what's the problem with autozone water pumps ? I just put one in 2 days ago. Is it worth the time (about 1hr) & money to bring it back and get a Mopar one ? I know the factory thermostat housing is sooooo bad for flow compared to an aftermarket one I saw
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Old 03-29-2014, 01:12 AM   #10
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Also OP if the leak is not really bad it may be in your interest to replace the coolant with water and add water wetter for the summer while trying to locate the leak to help get you cooled down a bit more. Another thing, make sure your t-stat housing is torqued down enough.

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