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it sounds like it could be boiling but just in case you should check your head gasket to. ive ran across many bubbly radiators due to head gasket and/or a ditched head. take off your radiator cap when the car is running but not very warm. let the car warm up some more but not to the temp that you think your coolant would start to boil. give it a couple revs and if you see bubbles your head gasket could be to blame, opening a gap to the combustion chamber.
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