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Q: coolant warning light on 1990 BMW 325is

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i have a 1987 325is that has the coolant warning light on. checked radiator/anti freeze levels, all is good.the car's temp is normal ,etc. what esle could be causing the warning light to stay on? could it be related to a water pump or ????
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Low coolant level will cause the light

Find the leak and correct the issue by means of parts replacement

In rare cases the coolant level sensor could be faulty
I have a 1994 325Is and at the end of summer and the beginning of spring the damn coolant light warning comes on. Changed the radiator but still have the same warning even though the level is fine. I'm guessing they have faulty sensors.
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