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Old 07-05-2009, 06:31 PM   #1
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over heating

Went to Idaho for the 4th and on the way Amy's TJ over heated going to down the freeway. We were going about 60 and the temp gauge went from about 210 to full redline in about a second, dropped back down for a few minutes and then went full redline again. We let it cool off and tapped the hell out of the thermostat housing and then tried driving again. It ran about 220/230 the rest of the way.
We got to the fireworks show and sat for a couple hours so it was nice and cool and did fine for the drive home.
Today Amy ran to the store and it did it again going down the freeway.
Water pump is pumping, fan is spinning, water is full. I'm assuming thermostat but I've never seen one go up that fast.

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Old 07-05-2009, 07:03 PM   #2
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Sure sounds like a thermostat. Probably the cheapest place to start too. I haven't had to change mine yet but unless they've changed significantly from other ones, just the spring failing.

Other than that, maybe time for a flush of the system (changing the thermostat is a great time to do that too).

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Old 07-05-2009, 09:36 PM   #3
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We flushed it a couple months ago but it needs it some more. It had quite a bit of rust build up.
I'm just surprised at how fast it over heated. I've never seen temp climb that fast. At first I thought maybe the gauge was having issues but it was definitely boiling when we stopped to cool it off.
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Old 07-05-2009, 11:26 PM   #4
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Well, if the thermostat gets clogged, the heat will build up fast.
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Old 07-06-2009, 01:48 AM   #5
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Thermostat. No question. Unless you can see seepage from your water pump main shaft, then the thermometer is the culprit. I had one sieze up on me once and blow out my upper radiator hose. It wasn't too serious but it WAS annoying.
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Old 07-06-2009, 08:10 PM   #6
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Is it a 4 cyl?
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Old 07-06-2009, 11:01 PM   #7
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definately check out the thermostat first, but I wouldn't rule out the water pump.
Hasn't happened to me in a jeep, but my chevy truck with v-6 did the same thing you are describing....water temp went red line, then back down, then back up. The water pump was bad.
I would not drive it another inch though until it's fixed. Very bad on the block!!!
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Old 07-07-2009, 09:15 AM   #8
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"""""about 210 to full redline in about a second, dropped back down for a few minutes and then went full redline again."""""

One second? Amazing - even an "instant on" water heater doesn't react that fast!

Sounds more like a temp sender problem, or the wire to it, or even the gauge.
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Old 07-07-2009, 10:48 AM   #9
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Had my 00 do that once for me.. Got off the express way, looked down 210.. turned right went 50 feet... red lined! Kept going back and forth. I stopped let it cool down.. never did it again.
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Old 07-07-2009, 04:35 PM   #10
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I delt with a very similar problem for almost a year and ended up putting another engine in.I have not pulling the old motor apart yet but I am figuring it has a fault in the head or head gasket.The only time mine would over heat was also on the interstate above 70 MPH or on slight to steep inclines on the freeway.Mine would go from 210 to 230 very quickly then to boiling over in just a second or two.Mine was not the temp sender or guage.I was running a separate guage with the factory one.I tried two radiators,3 types of fans,2 thermostats and even replaced the water pump,hoses and belts.I still think it is a fault in the head that allows the coolant system to build up to much pressure and not allow the coolant to flow.As soon as I would pull off the freeway and drive in slower traffic it would cool back down and run fine at slower speeds.
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Old 07-07-2009, 05:36 PM   #11
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The fan might be spinning, but it might not be spinning fast enough. If the clutch goes bad it can cause some serious over heating. I'd flush the radiator again with a new thermostat and fill it up with 50/50.
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Old 07-07-2009, 06:08 PM   #12
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A rapid change in temperature can also be caused by nothing more than air in the cooling system from the air not having been bled fully out after opening it up. A bubble where the temperature sender is can hold superheated air instead of coolant.
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Old 07-07-2009, 06:16 PM   #13
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Mine did the same thing Mine was the water pump going then went luckily in front of a sushi restaurant.Changed the pump and found out it sat for too long w bad water in it and rusted the holes up so the water couldnt move fast enough through the radiator.Installed a new rad, thermo, hoses ,and pump and replaced the cracked shroud all was less then 200$ No more problems.
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Old 11-15-2009, 01:47 PM   #14
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I have a 00 that is doing the same thing plus the heater want heat. Flushed, changed thermostat, hoses and water pump, but the heater doesn't get warm and it will overheat on the freeway.
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Old 11-15-2009, 03:38 PM   #15
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We ended up changing the radiator and water pump on ours. That fixed it.
Here's my write up on it.
http://www.wranglerforum.com/f5/radi...d-r-36140.html
Hope this helps.
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Old 11-15-2009, 08:13 PM   #16
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mine did it three seperate times while playin in the mud,i changed the thermostat and it stopped. then a week later i found the piston in the oil pan after a wheelin trip. GOOD TIMES

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