Coolant sensor light keeps coming on

trehman · 08-26-2020, 06:40 PM

Hey folks,

Have a 2007/335i/coupe/150k miles

For the last 2-3 months, the coolant light on the dashboard has surfaced intermittently. It stays on and within 4-6 seconds, it disappears. I took it to a local mechanic and he did run a pressure test and wasn't any leak so he filled it up with distilled water/coolant and then few days later, it came back. I also did a coolant bleed myself, thanks to youTube and again, few days later it came back on. The water pump is working fine. Also the car hasn't run hot outside of regular temp. Any ideas on next steps?

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E92William · 09-08-2020, 12:25 AM

Any codes at all?

trehman · 09-09-2020, 05:24 PM

Quote:

Originally Posted by E92William

Any codes at all?

No code. I might look into replacing the expansion tank. Have a feeling it's the sensor that's in the tank itself that's throwing this warning light.

08-26-2020, 06:40 PM	#1
trehman Enlisted Member 3 Rep 30 Posts Drives: 335i Join Date: Mar 2018 Location: San Francisco, CA iTrader: (0)	Coolant sensor light keeps coming on Hey folks, Have a 2007/335i/coupe/150k miles For the last 2-3 months, the coolant light on the dashboard has surfaced intermittently. It stays on and within 4-6 seconds, it disappears. I took it to a local mechanic and he did run a pressure test and wasn't any leak so he filled it up with distilled water/coolant and then few days later, it came back. I also did a coolant bleed myself, thanks to youTube and again, few days later it came back on. The water pump is working fine. Also the car hasn't run hot outside of regular temp. Any ideas on next steps?
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09-08-2020, 12:25 AM	#2
E92William Banned 1998 Rep 2,026 Posts Drives: 2008 E92 328xi Join Date: Nov 2019 Location: Miami iTrader: (0) Garage List 2008 BMW 328xi [0.00]	Any codes at all?
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