Coolant light goes on and off
On my 2000 BMW 328Ci manual the coolant light comes on while idling...when I reach about 40 mph or so it goes out and then comes back on when I stop then goes back out again when I reach about 40mph. The coolant level is fine. This all happened after the expansion tank failed and I replaced it...so the coolant level sensor is new. I'm going to buy another sensor anyway, but I was just curious if this could be something else. Thanks for any info.