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Q: overheating, check engine light, low coolant light, coolant in radiator on 1998 Chevrolet Lumina

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
New head gaskets, new radiator...still found coolant in radiator. New oil, filter. Pressure check ok. Check engine light keeps comming on. New gas cap and replaced light sensor twice. Mechanic said drive it around for a week and see if the overheating and low coolant light comes back on and check coolant reservoir daily.
NOW WHAT? Any ideas appreciated.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Turns out I had a pinhole leak in one of the heads. Replaced it and every thing is now OK. Was told this is not surprising because the coolant required by Chevy is very corrosive on the aluminum used in the Chevy heads.
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