Loss of coolant and overheating. - JeepForum.com
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post #1 of 13 Old 10-12-2017, 07:45 PM Thread Starter
jeepinjoeu
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Loss of coolant and overheating.

So my 01 tj has been having a few cooling system problems lately, I've had a few gallons of coolant go missing and have had to top it off almost every day or 2. Occasionally heat doesn't blow hot but always comes back quickly. The engine is running fine, no misfires or smoke coming from the tailpipe. No leaks coming from anywhere in the cooling system (I haven't looked at the weep hole yet which I will do tomorrow). The jeep has reached 260F a few times after sitting in traffic for more than a few minutes.

I performed a pressure test on the system, held 20 psi for 30 min, no leaks anywhere. I was thinking potentially it could have a blown head gasket but no bubbles in the coolant or pulsating with the pressure gauge while the engine was running, so from what the book tells me that's a no. I performed a compression check for the hell of it and all cylinder were between 130-140 psi, so all good.

I replaced all the coolant and hoses 3 months ago with silicon hoses and Mopar 5 year. The radiator is the original one.

What is the next step I should take?

Another thing I should note, after I drove to work the other morning (45min) I sat in the Jeep with the heat on full blast for a few minutes, and next thing I notice the jeep is at 260 and the radiator cap pressure release blew, steaming everywhere, I thought the Jeep was on fire for a second. Why would the have happened as well? T-stat stuck closed?

Thanks all.


2001 TJ, 4.0, Auto, 35's, Locked Dana 44's, 5.38s, Atlas 2
I want more wheelbase...
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post #2 of 13 Old 10-12-2017, 08:21 PM
toximus
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Quote:
Originally Posted by jeepinjoeu View Post
I replaced all the coolant and hoses 3 months ago with silicon hoses and Mopar 5 year. The radiator is the original one.
Was this before or after the leak started?

Does the fluid only disappear while the engine is running, or can it disappear overnight?

Have you changed your oil lately?

Does the 2001 have the tranny cooler at the bottom of the engine rad? If so, check your ATF.


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post #3 of 13 Old 10-12-2017, 08:40 PM Thread Starter
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Quote:
Originally Posted by toximus View Post
Was this before or after the leak started?

Does the fluid only disappear while the engine is running, or can it disappear overnight?

Have you changed your oil lately?

Does the 2001 have the tranny cooler at the bottom of the engine rad? If so, check your ATF.
Replaced 3 months ago, loss of coolant started probably 3 weeks ago.

It seems to disappear every time I drive and overnight, every time I check after a drive the bottle is empty and if I let it cool off and open the cap the radiator has lost some. I do not check every day, probably every other day or 3rd day.

Changed oil 2,000 miles ago, no coolant on the dipstick at oil or trans.

Yes the trans cooler is part of the radiator, is it common for it to crack internally and get into the trans?

2001 TJ, 4.0, Auto, 35's, Locked Dana 44's, 5.38s, Atlas 2
I want more wheelbase...
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post #4 of 13 Old 10-12-2017, 08:54 PM
toximus
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Originally Posted by jeepinjoeu View Post
Yes the trans cooler is part of the radiator, is it common for it to crack internally and get into the trans?
I've never seen an actual case of it happening, but I'd guess it's possible. Somebody else would know this better than me.

What type of coolant are you adding?


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post #5 of 13 Old 10-12-2017, 09:05 PM Thread Starter
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Quote:
Originally Posted by toximus View Post
I've never seen an actual case of it happening, but I'd guess it's possible. Somebody else would know this better than me.

What type of coolant are you adding?
I figure it could happen, Mopar 5 year coolant 50/50

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I want more wheelbase...
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post #6 of 13 Old 10-12-2017, 10:02 PM
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Have you checked the transmission fluid?...
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post #7 of 13 Old 10-13-2017, 12:28 AM
TheBoogieman
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Quote:
Originally Posted by jeepinjoeu View Post
So my 01 tj has been having a few cooling system problems lately, I've had a few gallons of coolant go missing and have had to top it off almost every day or 2. Occasionally heat doesn't blow hot but always comes back quickly. The engine is running fine, no misfires or smoke coming from the tailpipe. No leaks coming from anywhere in the cooling system (I haven't looked at the weep hole yet which I will do tomorrow). The jeep has reached 260F a few times after sitting in traffic for more than a few minutes.
My 2000' had the exact same symptoms when my head had a small crack in it. No obvious signs, other than disappearing coolant. It overheated when sitting at stop lights too long as the coolant got low. I'm guessing the coolant was burning off, although you couldn't smell it through the exhaust. I drove it that way for 6 months and adding coolant every few days got too expensive.

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Why also would he need a rare as hen's teeth Dana 44 out of another TJ which will eventually lead to him swapping in a POS 8.8 because he can't find one?
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post #8 of 13 Old 10-13-2017, 06:00 AM
Athensdawgs81
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Have you looked around the weep hole on your water pump for any signs of leaking. I was slowly losing coolant for about a year and could not find it. Finally my weep hole started pouring coolant. I figured it was probably slowly leaking the whole time and I just didn't notice it. It's so hot around there I figured it was evaporating before hitting the ground until the day it started gushing.
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post #9 of 13 Old 10-13-2017, 09:39 AM
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is your overflow bottle low as well? Could the Rad cap not be pressuring? I was losing coolant weeks ago and almost overheating , only in traffic. I replaced my Cap (18lbs) and all was good and has been since.... Simple, cheap place to start.

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post #10 of 13 Old 10-13-2017, 01:28 PM
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My '00 XJ and '00TJ both cracked the head around 140k. The xj it would drink coolant and it became mixed with the oil.

The TJ would use small amounts of coolant (about 1gal a week) nothing on the dipstick. But would overheat in traffic and on the trail. I pressure tested the TJ while cold and it would pass. The crack only opened while hot.

I would be prepared to swap the head. Sorry.
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post #11 of 13 Old 10-15-2017, 09:47 PM Thread Starter
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Thanks for all the info guys, I was thinking it was either going to be a head gasket or a cracked head. I only have around 70k miles so I didn't think it would happen so soon. I guess I'll pull the head next weekend and send it down to the machine shop to have a magnetic particle inspection done.

Anyone know of any aftermarket heads that pair well with the 4.0? Or should I just go back with OEM?

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I want more wheelbase...
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post #12 of 13 Old 10-16-2017, 07:34 AM
Ross
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I had a 4runner act like this. One symptom that pops up with Toyota, and maybe jeep, is rougher starts after it cools. Coolant would leak back into the cylinder when the motor was off. I had no smoke out the tail pipe, no mixing in the oil and no bubbling in the radiator.

Pull your plugs and look for any that look unusually clean.

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post #13 of 13 Old 10-18-2017, 07:00 PM
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I had a slow coolant leak for years, no tell tale signs of anything wrong, changed hoses, no signs of leaks, no coolant smells (until the end)
come to find out the fitting on the radiator going to the engine had a small crack that allowed to coolant to escape, but evaporate off very quickly due to the fan.
Once the crack got big enough a couple of pieces broke off and allowed more coolant to come out.

I didn't notice the crack when I changed hoses..... maybe something to look at?

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