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Old 10-13-2011, 12:12 PM   #1
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Overheating TJ

I have a '99 TJ Sport w/ the 4.0L. Its resently begun to overheat both on the hwy and in town after 15 minutes of driving. I replaced the thermostat, flushed and changed fluids and checked the fan clutch which appears to be opperating correctly. Same is true of the pump. There's no oil in the coolant and no coolant in the oil. There's no smoke blowing out the exhaust pipe. I'm not sure if it can still be a head gasket, but I'm out of ideas as to why its overheating... Any ideas?

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Old 10-13-2011, 12:18 PM   #2
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You may have developed an air bubble. Search for more info on the forum.

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Old 10-13-2011, 12:19 PM   #3
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What temps is it getting too?
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Old 10-13-2011, 12:19 PM   #4
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Do you have a stock intake on it? Maybe it's clogged. Check that out then mauve get a CIA on it not sure how much it will help but more airflow and cooler air could help out Alot.

I personally have a trail jammer CIA on mine. I like it Alot. Plus it has an awesome sound when you first turn it on.

I bought mine in a package. It came with a CIA a throttle body a throttle body spacer and a chip for 600. There's a noticeable increase in power. But be carful where and how you mount the chip mine fell and melted...
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Old 10-13-2011, 01:47 PM   #5
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Temps are getting to 260F per the interior gauge.


I thought about an air bubble, but its acting the same both before and after the flush and coolant change.
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Old 10-13-2011, 02:07 PM   #6
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Quote:
Originally Posted by topher38 View Post
Do you have a stock intake on it? Maybe it's clogged. Check that out then mauve get a CIA on it not sure how much it will help but more airflow and cooler air could help out Alot.

I personally have a trail jammer CIA on mine. I like it Alot. Plus it has an awesome sound when you first turn it on.

I bought mine in a package. It came with a CIA a throttle body a throttle body spacer and a chip for 600. There's a noticeable increase in power. But be carful where and how you mount the chip mine fell and melted...

CAI's suck and have absolutely nothing to do with a Jeep over heating. A clogged intake and the jeep simply would not start.

Does it show signs of overheating? Boiling over, radiator boiling after shut down, loss of coolant, etc? It is possible to be a bad temp sending unit.
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Old 10-13-2011, 02:35 PM   #7
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Its getting hot. The coolant boils quite well.
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Old 10-13-2011, 04:02 PM   #8
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Quote:
Originally Posted by arcountryboy

CAI's suck and have absolutely nothing to do with a Jeep over heating. A clogged intake and the jeep simply would not start.
I was just suggesting an idea. No need to jump down my throat.
And yes it can cause the jeep to over heat. Little air flow causes the engine to work harder, thus creating more heat.
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Old 10-13-2011, 05:25 PM   #9
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are you positive the pumps impeller is turning and not just the shaft spinning? Although I would think that would make a horrible sound. The only other thing I can think of is the t-stat went in backwards. Something is keeping the coolant from circulating. The flush could have knocked some crud loose and has clogged the rad. Guessing. Do you still have the old t-stat?
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Old 10-13-2011, 05:40 PM   #10
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Ide check the cap and also look to see if the ac condenser (if you have one) or radiator fins are very dirty or clogged and preventing airflow through. Also see if the top hose entering the radiator has pressure when squeezed and if it get hot at operating temps.
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Old 10-13-2011, 06:03 PM   #11
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also i know you dont want to hear this but it could be a blown head gasket sometimes they blow out and not in a block tester will tell you, its a clear turkey baster looking tool you put a special blue fluid in take your rad cap off and hold it over the hole if the fluid turns yellow its a head gasket. it means that you are getting combustion gasses into you cooling system.
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Old 10-13-2011, 06:23 PM   #12
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Could be the water pump. Or the thermostat u put in could be bad. Was the correct thermostat installed? Not trying to insult u but I have read other threads where they decided to changed the temp range by getting a diff stat. Jeeps run a bit hotter per designed before the thermostat opens.
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Old 10-13-2011, 09:27 PM   #13
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Quote:
Originally Posted by topher38 View Post
I was just suggesting an idea. No need to jump down my throat.
And yes it can cause the jeep to over heat. Little air flow causes the engine to work harder, thus creating more heat.
Really, are you for real?




OP, the one that sugested the air bubble has the most sense.
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Old 10-13-2011, 09:37 PM   #14
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i assuming he has bled it after replacing the parts. what caused it to overheat in the first place, in the initial overheating an air pocket then would point to a leak somewhere???
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Old 10-13-2011, 10:49 PM   #15
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Thanks for the suggestions. I'm going to check it / bleed out any air that may be in the system and look into to the water pump tomorrow.
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Old 10-14-2011, 06:50 AM   #16
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Quote:
Originally Posted by topher38 View Post
I was just suggesting an idea. No need to jump down my throat.
And yes it can cause the jeep to over heat. Little air flow causes the engine to work harder, thus creating more heat.

Alrighty then.....
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Old 10-14-2011, 12:30 PM   #17
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First, I would burp the radiator and see if that helps. If not, change the water pump, it is not too difficult to do. Good luck.
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Old 10-14-2011, 12:39 PM   #18
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I agree sounds like air. Also when you flushed the system, did you replace the hoses? If so did you put the spring back in the lower hose or make sure it was spread out inside?
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Old 11-01-2011, 09:00 AM   #19
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Thanks for the suggestions. It turned out to be a clogged radiator even though the top of it ,under the gas cap, looked fine. Put in a new radiator and my overheating problems were solved.

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