Coolant system diagnostic assistance, please?

Zack A · **Posted:** Wed Jan 12, 2011 1:13 pm

I've had the same issue with the steam but only when its cold. It did it yesterday but my temp was 199.4. I would like to know what it is too.. I was kinda worried but since no CEL or overheating I figured it was because of the cold

JJsTJ · **Posted:** Wed Jan 12, 2011 2:30 pm

i'd get it pressure tested to make sure there are no leaks or identify where they are. don't want a minor leak becoming worse when you are least ready to deal with it.

tjkj2002 · **Posted:** Wed Jan 12, 2011 9:29 pm

Rather common issue on Jeep radiators in extreme cold temps.The side tank seals shrink so much that they leak a little in the very cold but once warmed up they do not leak,after a few cycles of this the side tank seal will just fail all together.

Same issue happened to my 2nd radiator(CSF brand),just a few drops here and there then one cold day all my coolant exited the lower passenger side tank in about 30 seconds.Watched it happen at work from inside the shop,glad I found a KJ radiator in town on a Sunday.

Zack A · **Posted:** Wed Jan 12, 2011 11:51 pm

Jayme was your steam coming from the right side of the grill?

tjkj2002 · **Posted:** Thu Jan 13, 2011 12:07 am

yellocoyote wrote:

No, the steam is actually coming from the overflow at the reservoir. TonyCRD suggested that I siphon off some of the fluid from when I overfilled it, and that doing so may correct the problem. I'm going to try that in the morning.

Otherwise the leak has gone away, like Troy said.

Overfilling just a little is not a concern and the steam you saw was 100% normal as the cooling system pushed some out to the overfill tank(part of the reservoir).But if you have any concern just replace the cap,only a few bucks and a good idea to change every few years anyway.

Coolant system diagnostic assistance, please?

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