Check coolant level warning - dead sensor?

Discussion in 'E36 M3 (1991-1999) and E30 M3 (1986-1990)' started by M3 Matt, Nov 18, 2019.

  1. 18 Nov 2019 at 2:42 PM #1
    M3 Matt

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    Hi all,

    I am getting this warning constantly and my coolant is fine.

    Likely the sensor has died I think.

    Are these easy to replace?
     
  2. 18 Nov 2019 at 4:48 PM #2
    MParallel

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    These sensors do fail over time.

    On M3's they are super easy to replace as they are screwed in from the top in the coolant reservoir. On the M52 it's screwed in from the bottom of the tank (marvelous!).

    So literally a 30sec job on the M3.
     
  3. 5 Dec 2019 at 9:43 PM #3
    Winno

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    Do a quick check. Make sure you havent put the sensor the wrong way 'round.

    This happened to me. Ordered new sensor, installed it. Light still came on.

    Scratched head. Looked. Figured out I had put new sensor the wrong way around. Turned sensor 180 degrees and all was well
    (groan).
     
  4. 5 Dec 2019 at 11:57 PM #4
    MParallel

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    Huh? There is only one way to fit it. Turning is axially doesn’t make a difference.
     
  5. 6 Dec 2019 at 1:31 AM #5
    Winno

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    Yeah there is. I know, I did it.

    Not saying I am proud of it :blink:
     
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  6. 6 Dec 2019 at 12:14 PM #6
    MParallel

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    I'd like to know how! Just in case I ever need to replace it and don't know it's in wrong.
     
  7. 6 Dec 2019 at 12:50 PM #7
    harrypevo

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    I can see how it could on the washer bottle where it fits in sideways. The coolant tank one fits in from above in an m3 so can't see how the orientation could make any difference!
     
  8. 6 Dec 2019 at 12:53 PM #8
    harrypevo

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    Also fwiw, the m3 part seems to be quite expensive, but by referencing some part numbers back and forward I found out that one from an e30 325i ( with check control ) would fit, so bought one for 1/4 of the price and it fitted and worked perfectly. I guess there could possibly be a slight difference in the trigger height, but none that I have noticed or enough to cause an issue.
     
  9. 6 Dec 2019 at 1:15 PM #9
    MParallel

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    Exactly my point. There is just one way you can fit it.
     
  10. 7 Dec 2019 at 11:51 PM #10
    Winno

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    Fark me I am a dumb ass. I looked under the bonnet and realise I was talking about the washer fluid level.

    Groan. As you were..
     
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  11. 8 Dec 2019 at 2:17 AM #11
    NZM3AN

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  12. 9 Dec 2019 at 12:56 PM #12
    MParallel

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    Finally I can sleep at night again.
     
  13. 9 Dec 2019 at 5:09 PM #13
    Mikescx

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    :muttley:
     

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