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Old 11-19-2010, 08:17 PM   #1
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99 2.5 overheating

99 2.5 auto 33"s 150k miles
Just have 4k on rebuilt motor and it started to overheat today. Cool day in Cali , noticed temp gauge was at 210 degrees on fwy, odd? So I continued driving and noticed it slowly climbing, engine making funny noise , decided to exit and as we got to the exit engine shut off. Wasn't even in the red yet!! I tried to crank engine and would not start, gauge was now in the red. So pushed to gas station. The reservoir was Practically empty and boiling . Don't understand was the gauge broken and I drove it on the red for awhile? I hope not because it will void my warranty, they put heat tabs in my engine. It cooled down I checked radiator and it was empty just a little steam. Put fluid back in and it starts up fine.
I noticed last week the reservoir was low so I topped it off . Now this!! Where is the fluid going???
Do you think I voided the warranty, it runs fine now , taking it to shop on weds.
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Old 11-19-2010, 08:19 PM   #2
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Quote:
Originally Posted by 4x4junkie
99 2.5 auto 33"s 150k miles
Just have 4k on rebuilt motor and it started to overheat today. Cool day in Cali , noticed temp gauge was at 210 degrees on fwy, odd? So I continued driving and noticed it slowly climbing, engine making funny noise , decided to exit and as we got to the exit engine shut off. Wasn't even in the red yet!! I tried to crank engine and would not start, gauge was now in the red. So pushed to gas station. The reservoir was Practically empty and boiling . Don't understand was the gauge broken and I drove it on the red for awhile? I hope not because it will void my warranty, they put heat tabs in my engine. It cooled down I checked radiator and it was empty just a little steam. Put fluid back in and it starts up fine.
I noticed last week the reservoir was low so I topped it off . Now this!! Where is the fluid going???
Do you think I voided the warranty, it runs fine now , taking it to shop on weds.
I also want to add as I drove it when I first noticed temp rising I turned the heater on and semi warm air came out , on the highest setting.

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Old 11-19-2010, 08:47 PM   #3
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I think either theres a leak or your engine is burning coolant.
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Old 11-19-2010, 09:10 PM   #4
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Did you burp the coolant? When you filled the radiator did you let the thermostat open up?
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Old 11-19-2010, 09:11 PM   #5
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Quote:
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I also want to add as I drove it when I first noticed temp rising I turned the heater on and semi warm air came out , on the highest setting.
Coolant level in radiator down below heater inlet pipe = no coolant in heater core = no heat.

What checks have you carried out for leaks?
Is your radiator cap turned fully (tight with lugs lining up across radiator)?
Any steam coming out your exhaust (white smoke)?
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Old 11-19-2010, 11:07 PM   #6
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No white smoke from exhaust , no I didn't burp the radiator, I don't even want to mess with it any more. I just hope I didn't melt the heat tabs . I'm thinking bad gasket??
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Old 11-20-2010, 11:14 AM   #7
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What is a "heat tab" and where "in" the engine would it be placed? It's entirely possible that you have a clogged radiator that needs replacement or a defective thermostat. I've always replaced the entire cooling system when replacing an engine in the past; new engines are tight and run hot anyway, and an old, clogged radiator just makes it worse.
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Old 11-20-2010, 01:04 PM   #8
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baring the obvious problems(anti freeze smell, steamie windows) i'd first check the fluid level(and "burp" it-leave cap off while running and let it get up to temp(may look like it's going to flow out just befor the thermostat opens-then the level should drop)) you should also be able to see the fluid flowing-if it doesn't drop, probably have a bad thermostat(can check by removing and putting in boiling water-or just replace-been a while but rem them as fairly cheap) and if not visably flowing i'd be looking at the water pump
you can also let it get hot(w/cap on), shut it off and look/listen for any leaks-may be steam if high, fluid if low. It's a fairly simple, straight forward system with limited parts that can go wrong but can become expensive depending on the location of the problem(leak) and how long before found/fixed
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Old 11-20-2010, 01:31 PM   #9
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I will try the burping method, thanks. What I mean by heat tabs is the engine rebuilders place these in the engine somewhere to save their ass through the warranty. Meaning they Will know if I ran the jeep while hot because heat tabs will be melted and thus voiding my warranty. I hope this hasnt happened. The jeep only heated up to the red once I pulled over and it shut down.
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Old 11-20-2010, 01:34 PM   #10
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I sense the loss of fluid contributed to the overheating - hence a leak somewhere. Take a look at Post #2 - no coolant available for heater when he first noticed the temperature rising.
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Old 11-20-2010, 01:58 PM   #11
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The reason your gage didn't show the actual temp is because there was no coolant touching the sending unit. It needs fluid contacting it to properly sense the temp.
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Old 11-20-2010, 02:02 PM   #12
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Just a guess but it sounds like maybe there was air in the system when it was originally filled. The sensor can't read right if the coolant level is low or there is air in the system so it may have run hot before and pushed fluid out. When it cooled it drew what it could from the reservoir and it probably wasn't enough and thats why the reservoir is empty.
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Old 11-20-2010, 03:08 PM   #13
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Quote:
Originally Posted by TJ Terry
The reason your gage didn't show the actual temp is because there was no coolant touching the sending unit. It needs fluid contacting it to properly sense the temp.
So do you think it's possible I drove way to hot since there was hardly any fluid in it. And the gauge didn't work properly since it was low. My only question is why was it low if I had just topped the coolant last week. No visible leaks and I have new water pump, thermostat, hoses.
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Old 11-20-2010, 05:36 PM   #14
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How's your motor oil looking for color and fullness?

Sounds like it's pushing out coolant somewhere. Did you check your radiator cap and your radiator hoses (top and bottom).

Is it running ok now. Is it overheating now?

Quote:
Put fluid back in and it starts up fine.
I noticed last week the reservoir was low so I topped it off . Now this!! Where is the fluid going???
Never use the reservoir as an absolute check for coolant level. Check the radiator itself. Your radiator was probably down then, and things kept getting worse.
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Old 11-22-2010, 03:41 PM   #15
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Ok 3 days later and I go to start engine and it shakes violently. I shut it off right away .When it first happened Friday it started fine once it cooled. Now this. WTF??
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Old 11-23-2010, 06:01 PM   #16
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Quote:
Originally Posted by 4x4junkie
Ok 3 days later and I go to start engine and it shakes violently. I shut it off right away .When it first happened Friday it started fine once it cooled. Now this. WTF??
Anyone??
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Old 11-23-2010, 06:29 PM   #17
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Possibly a leaking head gasket allowing coolant to enter a combustion chamber, and this would also cause the overheating and coolant loss you described earlier.

Or it's just being demonic. Time to call in The Exorcist.
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Old 11-23-2010, 09:41 PM   #18
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Quote:
Originally Posted by 4x4junkie View Post
Ok 3 days later and I go to start engine and it shakes violently. I shut it off right away .When it first happened Friday it started fine once it cooled. Now this. WTF??
Any check engine light/codes?

Could be head gasket failure. Has the coolant level dropped while the Jeep was sitting? Any water in the oil?

Best to get the engine checked out.
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Old 11-29-2010, 06:36 PM   #19
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Quote:
Originally Posted by TJeepman

Any check engine light/codes?

Could be head gasket failure. Has the coolant level dropped while the Jeep was sitting? Any water in the oil?

Best to get the engine checked out.
Actually it did have check engine light on, and shop just called and said blown head gasket.
I am relieved because that means it was there work during the rebuild that caused the breakdown.
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Old 11-29-2010, 06:37 PM   #20
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Quote:
Originally Posted by JD Adams
Possibly a leaking head gasket allowing coolant to enter a combustion chamber, and this would also cause the overheating and coolant loss you described earlier.

Or it's just being demonic. Time to call in The Exorcist.
Yes shop just confirmed blown head gasket. I believe my ass is covered in the warranty.

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