Check engine coolant light comes on briefly when starting or shutting off engine once it reaches normal operating temperature

Check engine coolant light comes on briefly when starting or shutting off engine once it reaches normal operating temperature. No over heating and coolant level is normal. Changed water pump and thermostat and bled coolant correctly. No leaks, normal operating temp, just this irritating check coolant warning. Since the cooling system is operating normally. Should I consider replacing float sensor in the expansion tank? Second request.

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This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: BMW 3-Series E36 Cooling System Flush

[Nick at Pelican Parts]

This could be due to a faulty coolant level switch.

- Nick