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Thread: 1995 325i Overflow isn't refilling

  1. #1
    Join Date
    Jan 2018
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    1995 325i

    1995 325i Overflow isn't refilling

    Hello all!

    I am a bit confused right now, every time I have been turning on my car I have been getting the coolant level low check. So of course that is concerning so when I went to check my overflow it appears to be empty until I screw off the cap. Whenever I screw off the cap the overflow will refill all fluid and it does not look like I have lost any coolant. The censor should also be fine because I replaced the censor along with expansion tank about 4 or so months ago.

    It does not appear that I am overheating or anything but something is definitely not working as intended right? I have been driving the car for about 8 months now and it just started doing this. Is this something I should be worried about?

    Thanks for any input!

  2. #2
    Join Date
    Oct 2012
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    E36, E70, i3
    You probably still have air in the system. Fluid moves when you open the cap.

    Sent from the dark side of the Moon

  3. #3
    Join Date
    Jan 2018
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    1995 325i
    Hm I am not sure how I could have gotten air in the system.
    Thank for the input though! I will definitely try bleeding it this weekend.

  4. #4
    Join Date
    May 2012
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    Central Wisconsin
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    '94 325i, '93 325is
    When the engine is cold, fill the overflow and run the engine, use your hand to run the throttle from under the hood. When the thermostat opens the upper hose will get hot. Keep adding coolant as it drops and watch for a steady stream spraying into the expansion tank. You will see it spray steadily with the engine around 2k RPM once there is no air. It will spit bubbles until all of the air pushes out. No need to open the bleed screw.
    '94 325i Sedan, Arctic Gray: UUC LTW FW, EVO 3 and DSSR, +.020 Maxsil pistons, ASC delete, Eibach shocks/springs, 16" contour reps 238k
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    '89 325i Vert, Alpine White: 5spd swapped. Sold
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  5. #5
    Join Date
    Jun 2010
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    NY
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    9,079
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    1997 328i
    You probably have a slow leak and an air pocket is forming, could be simple like a hose clamp needs snugging.
    Attn. NEWBIES: Use the search feature, 98% has already been discussed.
    Click the search button, select "search single content type", select the "e36 sub forum" specifically, try the "search titles" then try the "search entire posts".

  6. #6
    Join Date
    Apr 2015
    Location
    Tennessee
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    1,736
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    1998 BMW 328i
    Its low on fluid. When you take the cap off, the pressure is released and an air pocket forms in the highest point of your system as the coolant moves to fill the tank back up.

    Sent from my VS987 using Tapatalk

  7. #7
    Join Date
    Jan 2018
    Location
    Las Vegas
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    My Cars
    1995 325i
    Yikes!
    Thanks everyone for the wisdom!

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