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Unread 08-27-2004, 09:51 AM   #1
rokclimbertx
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overflowing expansion tank

.hey guys.
my sons 92 xj is starting to puke water from the overflow tank. i did a search but nothing helpful came back.
it doesnt seem to be overheating, drive & idling temps are normal. however, when the engine is shutt off, out it comes. the first time we noticed it the puke was white & foamlike, coupla times after just watery. seems there isnt a lot of antifreeze it there.
ideas on what we should look into first? have it flushed? new t-stat? water pump? or radiator?
thanks, we're baffled by the foam!

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Unread 08-27-2004, 11:08 PM   #2
rokclimbertx
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bump...

gonna pull out the t-stat and see what that does first as soon as i can find a place that has gaskets... still looking for ideas on why this is happening... thanks!
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Unread 08-27-2004, 11:31 PM   #3
BrunoS
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Suggestion if you can't find a gasket: try using hi-temp silicone in place of gasket, it works well. just use a good brake cleaner to clean ALL crud, grease off of metal surfaces, and let it dry a couple of hours after boting back together before refilling coolant and starting engine. Use only enough silicone to do the job, it does not take much.
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Unread 08-28-2004, 02:00 AM   #4
coppertop71
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You can try to change the T-stat and see what happens but if you want to solve the problem for good get rid of the pastic expansion tank. Here is a link from one of my earlier post with a picture of what I have on mine. If you can find a machine shop show them a picture and see if they can make one cheaper than the $140 or so I had to pay.

The white foam is probably caused from air bubbles from boiling water in the head. The plastic tank doesnt hold in pressure to increase the boiling point of the coolant water begins to boil inside the head probably near the #6 cylinder and floats the air bubbles up through the system.

My link to replace the plastic tank
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Unread 08-28-2004, 08:43 PM   #5
rokclimbertx
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update... went and had the radiator flushed and pressure checked... cooling system came up fine but the rad. cap was bad... replaced it and all seems to be well...
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Unread 09-08-2004, 09:35 PM   #6
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Update Cont...

OR SO WE THOUGHT!

after a few weeks of good running it's back... the strange foamy overflow... not everytime the engine runs though... here's what happened today:

son was on his way home from work, stopped at a friends, turned the engine off and immediately heard the foam dripping from the overflow tank... after letting things cool down we drove it home and let it cool before taking the t-stat out (which we never did)... went out to pull it and we popped the rad cap to see if it was full, it wasn't so as we were off gettin a jug of water the foam started pouring out of the radiator itself... got the jug, poured water in until full which stopped the foam... rad cap back on and watched the temp gauge... heats up to almost in the red, fans kick on & cools back to 210... over & over 3 or 4 times then gets into the red and we shut it off... an hour later the kid leaves for home on the way there he says it did the heat up/cool off thing all the way home... come to a stop, heat up... start moving, fans kick in and cools off... 5 or 6 times then as he's pulling up to house it gets in the red...

tomorrow we are pulling the t-stat to see if that will keep the temp down but thats obviously not the problem... ideas? suggestions?

thanks for the help! anyone goin to moab next month for the NAXJA thing?
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