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Old 04-18-2007, 12:10 AM   #1
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2000 TJ radiator cap keeps blowing

my 2000 TJ raidator cap keeps blowing out coolant. it is not over heating. I'm not sure what is causing the issue.

Back story

It kept blowing replaced the cap with a nonvented cap.... bad idea cause the water pump to leak

Replaced the water pump and replaced the radiator cap with a stant 18lbs vented cap like the OEM one.

Any ideas... thanks

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Old 04-18-2007, 12:54 AM   #2
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18lbs really? I think its saposed to be 16lbs, but I could be wrong... but you sure that the plastic neck on the radiator isn't broken or chipped?

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Old 04-18-2007, 01:06 AM   #3
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Yeah the original one was 18 lbs. I think I may need a new radiator, thinking it may be clogged or something. I flushed it out real good when I changed the water pump, and I found there is rust colored gunk in it again.
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Old 04-18-2007, 02:30 AM   #4
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Yeah the original one was 18 lbs. I think I may need a new radiator, thinking it may be clogged or something. I flushed it out real good when I changed the water pump, and I found there is rust colored gunk in it again.
That's real bad.i would take it have it professionally flushed where they hook it up into a machine an pump it..
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Old 04-18-2007, 03:05 AM   #5
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Yeah, that's definitely not good at all. You need to have that flushed for sure!!
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Old 04-18-2007, 08:41 AM   #6
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Looks like you filled your radiator with mud.
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Old 04-18-2007, 08:56 AM   #7
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I know it is warm in the south most of the time, looks like someone has run water in there. Its not only antifreeze but a coolant as well and will keep it from boiling over. Did you buy new/used ? Have flushed an fill with the proper mix of antifreeze and water.
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Old 04-18-2007, 09:05 AM   #8
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Looks like either mud, rust or .... Dexcool mixed with antifreeze
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Old 04-18-2007, 09:20 AM   #9
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By looking at your radiator, it would seem that there is limited to no circulation. The water (I'm guessing no antifreeze) heats up and expands and blowing the cap is the path of least resistance.

As everyone has said, professional flussing is in order. Personnally, once the flush was complete, I would put in a new radiator. I would flush first to get the crud out of the engine water jackets first though.
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Old 04-18-2007, 09:28 AM   #10
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That thing needs a good flushing.
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Old 04-18-2007, 01:38 PM   #11
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The radiator was just flushed yesterday. And I added 50/50 coolant/water. Then I drove it to work. That picture was taken last night after I drove about 80 miles to/from work. Then it turned rusty again....

So today I flushed it again, removed the radiator and put a garden hose in the host that goes to the engine from the top of the radiator and flushed out the engine reall good. Now I'm going to drop a new radiator in and new coolant.

FYI I have owned this jeep since it was new in 2000 and I flushed and added new coolant about a 1 year ago, before all this happened...
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Old 04-19-2007, 07:33 AM   #12
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This looks like the classic "Head Gasket Milkshake Syndrome". I think you might be losing your head gasket. What does your oil look like?

Did you change your thermostat when you did the pump?
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Old 04-19-2007, 12:37 PM   #13
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I changed the thermostat about 1 year ago...
I too was worried about the head gasket, check the oil and looks fine... no milky oil
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Old 04-20-2007, 06:26 AM   #14
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Stop Leak?

Have you ever put any "Stop Leak" in the radiator at one point or another? That stuff will produce a nastly looking sludge in your cooling system after a while.

What does your temp gauge read under normal driving conditions? Is it in the red zone? I understand your cap is popping but I'm curious about the engine temp.

Does your heater throw out heat under normal driving?

I'm trying to get a better idea of your situation.
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Old 04-20-2007, 10:01 AM   #15
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Looks like either mud, rust or .... Dexcool mixed with antifreeze
Bingo, thats what it looks like for sure. Or he used river swamp water after a hurricane... I would not do the radiator till you get all the gunk cleared out, oh, turn the heater on hot other wise the heater core does not get flushed well. Try using the prestone 7 hour stuff, seen that clean a crudded up rad so that the solder in the core is even shiny...
On your mix, you use tap water or distilled water ? distilled is preferred.
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Old 04-20-2007, 03:09 PM   #16
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Agreed. I would remove the radiator and thermostat. Flush the entire system until the red sediment was removed. I would backflush it the other way to just be anal, install a new t-stat and new radiator as a minimum.

I bet the heater core is probably gummed up too. The last piece is the pump. You could evaluate the fluid, verify it's particulate free and keep your eyes glued on the temp gauge to make sure the pump is circulating and not clogged.

Your radiator looks like something out of some horror movie.... Did you stop at some goofy garage on an interstate and the evil mechanic slipped something into your radiator when you weren't looking or something? It sure looks like oatmeal or stop leak was added to your system.... That stuff is just not supposed to be in there and if you don't get it out you're going to toast your motor for sure.

Good luck and let us know how it goes.

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