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Thread: Low coolant warning.

  1. #1
    Join Date
    Mar 2019
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    Mill Creek, Wa.
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    2013 BMW 328i, X5

    Low coolant warning.

    Hi All, I've a 2013 328i. Recently I get a low coolant warning and chime. Check the expansion tank as the warning suggests, but coolant is at full mark when cold and still coolant is visible when engine is at temp. Never over heats. Recommendations?

  2. #2
    Join Date
    Aug 2008
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    North Potomac, MD
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    2011 E90 328i
    What is the level in the radiator. Also, my '98 M3 does the same thing. I guess nothing with BMW ever changes!

  3. #3
    Join Date
    Feb 2005
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    MRster / Z4 M4i / X5 M50
    Quote Originally Posted by JonII View Post
    Hi All, I've a 2013 328i. Recently I get a low coolant warning and chime. Check the expansion tank as the warning suggests, but coolant is at full mark when cold and still coolant is visible when engine is at temp. Never over heats. Recommendations?
    If the car is telling you the coolant is low, but you can verify it is not, then I would suspect you have a bad sensor.
    2002 M Roadster, Steel Gray Metailic, Gray Nappa Leather, Black Soft Top, Steel Gray Metailic Hard Top, TC Kline Double Adj Shocks with H&R Springs, Stromung Exhaust, SSR Type C Wheels. Looking for a new home.

    2022 Z4 M40i, Misano Blue Metallic, Prem Pkg, Driver Assistance Pkg

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  4. #4
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    Correct. Sensor is bad, seen it a million times. Get a new expansion tank. Replace it, fill it, and bleed the system properly (most important step).
    ASE and BMW Master Certified Technician

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