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00 TJ Radiator exploded, heater half orig. temperature


 
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socaldivemaster
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Joined: 22 Dec 2006

PostPosted: Fri Dec 22, 2006 9:21 am    Post subject: 00 TJ Radiator exploded, heater half orig. temperature Reply with quote

Well my first problems ever after 135,000 very hard miles began 4 months ago with a waterpump replacement. Everything was peachy as usual until this week. I was on my way to work and my radiator exploded. It cracked horizontally almost completely across the bottom front of the plastic bottom of the radiator. I replaced the radiator with a factory OE replacement and it wouldnt circulate coolant. I then removed the T-stat to see if it was seized and hoping it would just freeflow through but to no avail.

I replaced the T-stat with a Kragen 190 degree unit, replaced both radiator hoses and the system seems to be working fine.

My concern now is that my heater now only blows out luke-warm air, not its usuall nuclear hot blast. The force of the air coming out is the same, but the overall heat is lowered by about half.

Is this a heater core issue now? Any input would be greatly appreciated.

I would also like any ideas as to the cause of this whole scene. Is the radiator explosion the cause of a known problem or usual TJ issue?

Thanks in advance.
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Tardis
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Joined: 07 Aug 2004
Location: Ohio

PostPosted: Fri Dec 22, 2006 12:06 pm    Post subject: Reply with quote

It's not unheard of for an old radiator to explode. They wear out just like any other part.
Here's what I would do about the heat...
Make sure it's topped off with fluid.
Check the cooling system for an air pocket. You might need to BuRp it.
There could be a blockage in the heater core, my YJ currently has this problem.
If your worried about the engine...
Check the radiator cap if you haven't replaced it already. If it sticks it'll build too much pressure.
Check the coolant for presence of combustion gases. There's a test kit called 'Block Chek', NAPA sells it. It's expensive, however some places will test the coolant for you free or for a small fee. If you have a cracked cylinder block/head, bad head gasket; Block Chek will confirm it. A cracked head made my friends XJ radiator explode. Now it has a new Head/Rad, and no issues since.
There's not much to the cooling system. Take your time and go through it and be as cheap about it as you can. A lot of time it's something stupid. Sometime not though lol.

Block Chek:
http://www.blockchek.com/kits.htm
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98' TJ, 99' XJ
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bltracer
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Joined: 04 Apr 2005
Location: Pollock Pines, CA

PostPosted: Thu Jan 04, 2007 5:08 pm    Post subject: Reply with quote

If you put any radiator sealer (Stop Leak) in the system, more than likely your heater core is plugged... My 97 had a leak... now no heat. I bought the heater core last summer and its still sitting in the garage.

Someday I will change it, Someday...

EDIT***

Well I looked into mine a bit more today, the heater core was free of clogs, I put compresse air through it and blew it out. I checked my circulation and there is None, Nada, Zilch. I pulled the lower heater hose (return line) off the heater and no fluid came out so I hit it with air and plenty of fluid came out with a little pressure. I pulled the top hose (pressure side) and there was no pressure with the motor running. Looks like my water pump isn't pumping... The little 4 banger doesn't overheat, but then again, its only 30 degrees outside...
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