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Old 05-10-2010, 12:18 AM
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Coolant Question.

This is my first jeep (66k) and i'm just getting to know it. All scheduled maintance has been done as per book including a radiator flush and refill at 30k. Runs great, does not run hot, fluids are very clean and is not losing coolant. I stopped and left the engine ideling today to talk to my folks. I turned it off and the overflow was 'gurgling", but was a normal level and temp guage normal. I know the coolant draws in and out of the resevoir. I don't think I have noticed this on my other past vehicles...but other than my motorcycles this is the only vehicle (4 wheel) I have had any interest in. Normal? thks

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Old 05-10-2010, 07:33 AM   #2
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You can get a build up of heat for a bit after you turn the engine off. Your engine was sitting at idle and would be fairly hot, maybe at the point for the fan to kick in when you shut it off. Some vehicles actually have fans that run for awhile after the engine is turned off to take away excess heat. I think maybe excess heat caused discharge into the reservoir, hence the gurgling.
Having said that, to do a proper check for coolant level, the reservoir isn't the only place to do it. The radiator cap needs to be removed and the level checked there.
As for the reservoir, if the level tends to stay in normal spots for cold / hot conditions, that's usually good. If the level is on the rise, that indicates the coolant, when cooling down, is sucking in air from somewhere, and coolant from the reservoir is not being returned as it should. If the coolant in the reservoir is on the wane, there's a coolant leak somewhere.
Anyway, keep a close check on the coolant levels in the radiator itself and in the reservoir tank for the total picture and to confirm if you have / don't have a problem to deal with. Also make sure your radiator cap is in good shape and is tight.
You are likely okay but it doesn't hurt to keep an eye on it anyway.
What year TJ /Wrangler do you have?

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Old 05-10-2010, 12:23 PM
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Hi and thanks. It's an '04. I'll probably replace the...

radiator cap to be on the safe side. I read a few threads where this seemed normal...and a few where it didn't seem normal. My first jeep. thks
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