Overflow tank boiling over. - JeepForum.com
 
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post #1 of 13 Old 01-03-2009, 03:26 PM Thread Starter
MSH5337
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Overflow tank boiling over.

Well, I just got my Waggy back after letting my brother-in-law (ex brother-in-law now) use it for a few months (will NEVER do that again). I'm now having a problem with it. After idleing for a few minutes, the overflow starts boiling over. The temp gauge isnt reading hot though. What could this be? Thermostat? Backed up radiator? I'm planning on flushing the system tomorrow. Any other ideas?


2001 Amber Fire TJ

1989 Wagoneer Limited. 4X4
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post #2 of 13 Old 01-03-2009, 03:35 PM
xjfever
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Could be a number of things. could be the thermostat, go ahead and change it when you do the flush. but you need to make sure all the air is out of the system, and that there are no leaks. the closed system needs to be pressurized.

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post #3 of 13 Old 01-03-2009, 03:54 PM
tangofox007
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Quote:
Originally Posted by MSH5337 View Post
After idleing for a few minutes, the overflow starts boiling over.
Every time I had that happen, the problem was with the bottle or the cap.
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post #4 of 13 Old 01-03-2009, 05:46 PM
ech0sh4y
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Sounds like a bad radiator cap to me. Might was to just splurge and get a new one for $10!


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post #5 of 13 Old 01-03-2009, 05:52 PM
tangofox007
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Quote:
Originally Posted by ech0sh4y View Post
Sounds like a bad radiator cap to me. Might was to just splurge and get a new one for $10!
There is no radiator cap on an '89.
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post #6 of 13 Old 01-03-2009, 06:00 PM
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If it does not read hot, most of the coolant is likey gone. If the cap on the resovoir bottle is bad, the coolant will boil (it is just like the cap for the radiator in an "open" cooling system--it is pressurized).

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post #7 of 13 Old 01-03-2009, 06:01 PM
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It's still the "cap". There's no "overflow" bottle on the closed system.
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post #8 of 13 Old 01-03-2009, 06:05 PM
ech0sh4y
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Quote:
Originally Posted by tangofox007 View Post
There is no radiator cap on an '89.

My bad... sorry for the misunderstanding


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post #9 of 13 Old 01-03-2009, 08:15 PM
hennigm4
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Replace the cap or the bottle first, burp the system of all air, there is a technique for the closed systems.
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post #10 of 13 Old 01-04-2009, 05:13 PM Thread Starter
MSH5337
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Well, I didn't get around to flushing the system today, but I did replace the bottle and cap. Didn't help.

2001 Amber Fire TJ

1989 Wagoneer Limited. 4X4
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post #11 of 13 Old 01-04-2009, 06:16 PM
AZ Jeff
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Quote:
Originally Posted by MSH5337 View Post
Well, I didn't get around to flushing the system today, but I did replace the bottle and cap. Didn't help.
Did you "burp" using the recommended approach? The closed systems are VERY sensitive to proper air removal procedures.

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I don't own an XJ any longer, but I still think they are the best of all the Jeep products ever made. My XJ was my favorite vehicle in my 50+ years of driving.
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post #12 of 13 Old 01-04-2009, 07:01 PM Thread Starter
MSH5337
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No, I haven't burped the system yet. What exactly is the "recomended approach" though? I'm not too familiar with the closed systems, and appreciate all the help.

2001 Amber Fire TJ

1989 Wagoneer Limited. 4X4
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post #13 of 13 Old 01-08-2009, 05:28 PM Thread Starter
MSH5337
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Problem solved! It was the thermostat. Thanks for all the help, you guys are great!

2001 Amber Fire TJ

1989 Wagoneer Limited. 4X4
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