Hi,

When I shut off my 90 TA, I'll get a somewhat violent bubbling into the
overflow tank, usually when the temp is above 190* (I can not think of
it ever happening at lower temps). I've gone through various checks for
common causes (compression, no oil in water, no water in oil, etc) with
no result. It went away for about a year after changing upper and lower
radiator hoses, but has since come back and nothing I do will stop it.

There is NO bubbling when the engine is running.

Anyone have any suggestions?

TIA,
Anthony