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Unread 01-03-2009, 03:26 PM   #1
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?

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Unread 01-03-2009, 03:35 PM   #2
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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Unread 01-03-2009, 03:54 PM   #3
tangofox007
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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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Unread 01-03-2009, 05:46 PM   #4
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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Unread 01-03-2009, 05:52 PM   #5
tangofox007
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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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Unread 01-03-2009, 06:00 PM   #6
mecompco
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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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Unread 01-03-2009, 06:01 PM   #7
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It's still the "cap". There's no "overflow" bottle on the closed system.
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Unread 01-03-2009, 06:05 PM   #8
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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Unread 01-03-2009, 08:15 PM   #9
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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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Unread 01-04-2009, 05:13 PM   #10
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.
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Unread 01-04-2009, 06:16 PM   #11
AZ Jeff
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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.
Did you "burp" using the recommended approach? The closed systems are VERY sensitive to proper air removal procedures.
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Unread 01-04-2009, 07:01 PM   #12
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.
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Unread 01-08-2009, 05:28 PM   #13
MSH5337
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Problem solved! It was the thermostat. Thanks for all the help, you guys are great!
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