just had radiator replaced due to a leak and light keeps coming on? on 2000 BMW 328i

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I also heard there is a kit that you buy online often needed on top of replacing radiator? My son loves this car but im afraid it's going to turn into a money pitt:(
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is the coolant level low when the light comes on??

have you checked for any other leaks??

Yes,the level is low when the lights on but it's not once overheated. Not sure if they checked for other leaks
there is another leak or this would not be happening. have it re checked and repaired.