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Unread 01-13-2008, 11:20 AM   #1
Optik45
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Jeep Overheated

I was driving and my jeep temp pinned to red and badly overheated. Smoke/Steam was barreling out of the engine compartment and then I heard a loud Pop noise. It happened a few miles from my house so I got it home safely. The Radiator is still full of coolant. What should I check/replace? I imagine the thermastat needs to be replaced, what else should I check for?

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Unread 01-13-2008, 12:45 PM   #2
Chris_
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Just cross your fingers. Check your oil after you drive it a little and make sure it doesn't look like chocolate milk. If it does, I'd start shopping for a new motor. My XJ overheated bad when my wife was driving it, and I got lucky. As soon as she got it home, I started running water through the overflow periodically to cool it, but I didn't start it until it was completely cooled. It got hot enough to melt the plastic covering on the injector wiring.

These 4.0s are tough motors, but if they get hot enough you can crack a head, blow a head gasket, and do valve damage. I'd wait before you start replacing everything. I'm still running the same water pump and thermostat, and this thing overheated 20,000 miles ago.
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Unread 01-13-2008, 12:59 PM   #3
Stu Olson
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Quote:
Originally Posted by Optik45
I was driving and my jeep temp pinned to red and badly overheated. Smoke/Steam was barreling out of the engine compartment and then I heard a loud Pop noise. It happened a few miles from my house so I got it home safely. The Radiator is still full of coolant. What should I check/replace? I imagine the thermastat needs to be replaced, what else should I check for?
Try giving a slightly more detailed explanation of "I was driving". Did you just finish wheelin'? Was your vehicle sitting in -40F temps all night long and you were a couple of miles down the road when it happended? You went through a deep mud pit and packed your radiator full of mud?

Hard for folks to determine what "might" have gone bad when they have nothing to go on. At that best, you're going to get guesses since no one can actually look at the problem you have.....so you might as well help those guesses be a bit more on target by providing some background info.
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Unread 01-13-2008, 01:08 PM   #4
CRAWLING 98
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Quote:
Originally Posted by Optik45
I was driving and my jeep temp pinned to red and badly overheated. Smoke/Steam was barreling out of the engine compartment and then I heard a loud Pop noise. It happened a few miles from my house so I got it home safely. The Radiator is still full of coolant. What should I check/replace? I imagine the thermastat needs to be replaced, what else should I check for?
Is there any leakage? You said there was smoke/steam barreling, then there should be a leak somewhere. If the radiator was still full I would start by checking the water pump and thermostat.
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Unread 01-13-2008, 01:21 PM   #5
Optik45
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By driving i just mean from work to home in 30F temps. I just replaced the Thermo. I let it run for a bit and noticed a lot of white smoke from the tailpipe and it is dripping a nasty black liquid from the tailpipe and muffler, I cant tell if it is oil or not. After about 10 minutes of idling, I noticed a steam like leak (smells like coolant) coming from the rear of the engine back by the firewall. Im unable to determine where exactly it is coming from.
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Unread 01-13-2008, 02:02 PM   #6
truckin88
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water pump?
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Unread 01-13-2008, 04:13 PM   #7
Optik45
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Well I thought all was dandy. I drove it to a restaurant about 5 miles away. Everything seemed great. Temps were good. Heater was working well. I drove home, as I pulled into the driveway, steam was boiling out of the engine bay. I opened the hood and coolant everywhere. Its like something exploded in there. There is no possible way to see where its coming from.
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Unread 01-13-2008, 04:25 PM   #8
CRAWLING 98
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Quote:
Originally Posted by Optik45
By driving i just mean from work to home in 30F temps. I just replaced the Thermo. I let it run for a bit and noticed a lot of white smoke from the tailpipe and it is dripping a nasty black liquid from the tailpipe and muffler, I cant tell if it is oil or not. After about 10 minutes of idling, I noticed a steam like leak (smells like coolant) coming from the rear of the engine back by the firewall. Im unable to determine where exactly it is coming from.
Quote:
Originally Posted by Optik45
Well I thought all was dandy. I drove it to a restaurant about 5 miles away. Everything seemed great. Temps were good. Heater was working well. I drove home, as I pulled into the driveway, steam was boiling out of the engine bay. I opened the hood and coolant everywhere. Its like something exploded in there. There is no possible way to see where its coming from.
Let it cool down and then refill the radiator and find the leak.

It is not un-normal for a small amount of water (condensate) to come out of the tailpipe and being black would be from a rich running engine. Pouring out water is another thing though.

You might want to conduct a compression test on all cylinders, check the oil for water.

There has to be some cause and you will need to find it, just driving around does not do it. You need to be looking in the engine bay while the engine is running to find the leak.
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Unread 01-13-2008, 04:48 PM   #9
ram1500dodge
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i did this the other day...had the rad full with water all summer because i have a small leak...the temp dropped below freezing and it all froze up. i overheated with the same thing happening, steam and water boiling over...however, the only water boiling was in the radiator, the rest of the water was still frozen in the engine. i got lucky, no leaks, didnt pop any freeze plugs and didnt crack the block. i know this really doesnt help, but your now the only one to overheat
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Unread 01-13-2008, 06:12 PM   #10
hawaii
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How did you not notice the engine getting hotter before the steam started "barrelling" out? My eyes are always on 3 things when they're not looking where I am driving - temp guage, oil pressure guage and gas guage. If those bastards move, I'm either cranking up the heat, checking my oil or filling up at a gas station.
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Unread 03-14-2008, 02:51 PM   #11
joemiranda
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I am new to this forum. I have a quick question to ask. I am hoping for the best but thinking of the worst. My mother, God bless her heart, she was driving my 97 Grand cherokee when it quit running. She said it started back so she drove it some more. Then the Jeep started boiling smoke out from under the hood. She kept driving. Well, it stalled one more time then she tried to start it but it did nothing. It did not turn the motor over or anything. She said it was rattling severely but she kept driving it. To make a long story short, she overheated it to the point of locking the engine down. When it cooled it was able to be turned over but will not start. I work about an hour away from home so I was not able to go assist her. The Jeep was towed to a buddies shop. When I got there the first thing I did was checked the oil, it looked fine. There was no chocolate milk in there! Checked the transmission fluid, there was no milk in there either. Checked the radiator and it was bone dry. I tried to start it and now it sounds like you have all the plugs pulled out. There is no compression in the motor at all. My diagnosis would be the timing chain.

So my question is going to be this. Is this an interference motor?
Would my first venture be on the front of the motor?
Should I just say bye bye to this 4.0 and just buy another one?

The Jeep has 168,000 miles and run strong until the day it overheated.

Any input would be greatly appreciated.
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Unread 10-11-2009, 11:19 PM   #12
hawkdrums
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Over heated Jeep

The other night I overheat my 2001 Jeep Cherokee Classic. I pulled over to find that my radiator had a hole in it. I had it towed home. It started up fine once it cooled, so no engine problems so far. The next day I replace the radiator and thermostat. The car started up fine and sounded good. The car was running nice and cool. I ran it for 20 mins. But, once the the car was warm I shut it off. I assumed that all was well. Then I went to restart it and now it won't hold an idle. If I hold the pedal it runs(sounds) fine.
I was wondering if this could be a heat sensor issue, computer issue, or engine.
Can anybody offer some insight ?

Thank You
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Unread 10-12-2009, 12:01 AM   #13
uvalax236
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To all you with these issues: go get a compression test and post the results here.
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