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My 06 TJ 4.0 just started doing this and sounds exactly like your description (teapot). It only stops for a fraction of a moment when I get on the gas while driving, but not while getting on the gas at a stand still. I have not driven it enough to see if it stops for few min after the coffee...

any update? My 06 just started this teapot whistle soon after a water pump change and reconnecting some vac tubes that were off. The whistle happens after start when the temp gets to about 180/200, it is consistent at idle and while driving. Only time i think it stops is the moment I get on the...