My 04 ecotec has a small coolant leak somewhere as well. So far it leaks pretty slowly and I only need to add fluid every month so it hasn't been fixed yet. It does however exhibit the same signs as yours. The coolant light will come on during acceleration or up a hill and then turn off; that is how I know it is starting to get low.
My bet is either in the radiator or a hose that isn't immediately visible
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2004 Alero 2.2L Ecotec 4 Speed Auto
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