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Old 07-26-2011, 02:11 AM   #1
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Coolant boiling?

Okay so my coolant is quite literally boiling in the res. I flushed the whole system a few weeks ago for the same issue and problem solved no more boiling. I've been gone for two weeks and she has been sitting in the 120 degree garage. And I took her out today stopped to talk to someone and she's doing it again. The temp gauge is reading fine but the engine seems VERY hot. I added more coolant when I heard it boiling and it calmed it down. But it's going to Moab here soon and I need to get this fixed. Any ideas?

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Old 07-26-2011, 02:27 AM   #2
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Can you check the mix? I think 50/50 should get you to 265*F before boiling.

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Old 07-26-2011, 02:33 AM   #3
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How did you flush the system?
Did you do it or a shop?
The vic was running and up to temp right?
Have you taken a look at the thermostat yet?
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Old 07-26-2011, 04:19 AM   #4
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It's running pure 50/50 premixed.
My buddy (backyard mechanic, drives a yj) helped me flush it. We drained it and ran water through the system. And it has a brand new thermostat from when it overheated down in Joplin. Seems to be a pattern.
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Old 07-26-2011, 04:23 AM   #5
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Are you sure the coolant was boiling or just expanding into the reservoir? It can make some really strange sounds.
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Old 07-26-2011, 04:42 AM   #6
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Quote:
Originally Posted by rmed4defense
Are you sure the coolant was boiling or just expanding into the reservoir? It can make some really strange sounds.
Boiling. The res was about to melt. When it did this before the radiator was full of coolant too but the engine was hot. But the gauge read normal.
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Old 07-26-2011, 08:05 PM   #7
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toss a new rad cap on it and see if that cures your ails
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Old 07-26-2011, 08:33 PM   #8
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toss a new rad cap on it and see if that cures your ails
X2, I'm betting your radiator cap is either leaking so the cooling system won't pressurize, or it's not the correct 18 lb. rating radiator cap. Non-pressurized coolant will boil much more easily than it should like when the cooling system is able to hold sufficient pressure.
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Old 07-26-2011, 10:04 PM   #9
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I'll pick up a new cap tomorrow. The shop did a co2 check today i think it was to see if it was a exhaust manifold leak? The guy told me my winch is blocking the rad from cooling the engine. Which sounds dumb.
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Old 07-26-2011, 10:25 PM   #10
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Which sounds dumb.
yes it does My coolant boiled and I got a new cap and the problem was solved. It boiled bad at 6000'
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Old 07-26-2011, 10:35 PM   #11
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I also had the "boiling" issue, I was pulling a few small bush stumps out in the yard in 4 low. When i turned the Jeep off, the res was puking up coolant. Pressure tested the cap the following day, wouldn't even hold a pound of pressure. slapped a new 18lbs cap on there, have not had the problem since.
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Old 07-26-2011, 10:36 PM   #12
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Well guess who's going to autozone tomorrow?
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Old 07-26-2011, 10:46 PM   #13
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jkaufman,

I don't wanna rain on your parade but you might consider doing a leakdown test on the engine prior to your Moab trip. If your boiling problem is caused by a head gasket you don't want to discover that 50 miles from pavement.

For what it's worth, your problem does, indeed, sound like a head gasket. We'll cross our fingers that the radiator cap solves it though.

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Old 07-27-2011, 12:28 AM   #14
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Quote:
Originally Posted by flyairam
jkaufman,

I don't wanna rain on your parade but you might consider doing a leakdown test on the engine prior to your Moab trip. If your boiling problem is caused by a head gasket you don't want to discover that 50 miles from pavement.

For what it's worth, your problem does, indeed, sound like a head gasket. We'll cross our fingers that the radiator cap solves it though.

Randy
I checked it with a o2 sensor today. No headgasket leak but thanks for the concern
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Old 07-27-2011, 08:51 AM   #15
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I am having the same issue with my 03 TJ. Guess i am off to autozone for a new one. for less than 5 bucks it is worth replacing to diagnose the problem.
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Old 07-31-2012, 10:57 AM   #16
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Talking Late to the party with the same issue

Quote:
Originally Posted by jkaufman_95 View Post
Well guess who's going to autozone tomorrow?
Short drives, no sweat. But get it out on the highway and it's a cranky cooling system. I'm a year late to this thread, but I too am off to Autozone to pick up a replacement. $5 is deff worth the diagnostic cost.
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Old 07-31-2012, 11:21 AM   #17
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Quote:
Originally Posted by Defiance03Sahara
I also had the "boiling" issue, I was pulling a few small bush stumps out in the yard in 4 low. When i turned the Jeep off, the res was puking up coolant. Pressure tested the cap the following day, wouldn't even hold a pound of pressure. slapped a new 18lbs cap on there, have not had the problem since.
I had the same problem. Pressure tested the cap and it held no pressure. Bought a new factory cap and problem solved.
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Old 05-09-2013, 10:22 PM   #18
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About a year behind on this thread... But I'm buying a new cap tomorrow...
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Old 05-10-2013, 10:40 AM   #19
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About a year behind on this thread... But I'm buying a new cap tomorrow...
Make sure it has the required 18 lb. pressure rating.
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Old 05-10-2013, 11:02 AM   #20
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Make sure it has the required 18 lb. pressure rating.
Thanks. I'll do that
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Old 05-10-2013, 04:27 PM   #21
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Mine is the original cap. I might replace it now just to prevent an over heating issue later.
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Old 05-10-2013, 04:33 PM   #22
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Just got an 18lb pressure for $6 at autozone

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