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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 08-21-2008, 03:57 PM   #1 (permalink)
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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.
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Old 08-22-2008, 10:12 AM   #2 (permalink)
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coolant sensor connector not correctly fastened... loose?
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Old 08-22-2008, 12:02 PM   #3 (permalink)
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Yeah I thought of that too... I disconnected it pulled it out and reconnected it...no luck.
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Old 08-23-2008, 09:24 AM   #4 (permalink)
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Red face

pull out the connector and place a paper clip across the pins... lights out?

If yes, then coolant sensor is stuck or gone bad.

If no change with paper clip attached and stand alone... then it might be a wiring prob.

Good Luck.
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Old 08-25-2008, 09:06 PM   #5 (permalink)
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Looks like the sensor is bad...thanks for the tips!!!
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