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Thread: Windshield Washer Reservoir Leakage?

  1. #1
    Join Date
    Jun 2010
    My Cars
    2015 BMW 740Li xDrive

    Windshield Washer Reservoir Leakage?

    2015 BMW 740LI xDrive, model F02
    If I fill the windshield washer fluid reservoir and then drive around for a couple of hundred miles, the fluid level will have dropped below a visible level.....without using the spray nozzles. Since the fluid reservoir goes behind a cover and into the wheel well area, one cannot really see how much the fluid level has dropped, or how much fluid remains.Since I do drive in snowy areas, it is frustrating to never know the fluid level and see it drop when not even used.

    The dealer said (essentially) don't worry about it, and just pay attention/add fluid when the low level indicator alarms. They didn't seem to have much interest in removing the wheel well cover to see if the reservoir was cracked or leaking at a connection point.

    Do other F02 owners have this same issue?


  2. #2
    Join Date
    Jan 2007
    Atlanta, GA
    My Cars
    2019 Silverado 2500
    If you are filling it up, all the way through the filler neck to where you can actually see if when you open the cap, you are over filling it. You are filling the neck of the tank. It will probably leak out where the neck meets the tank. That's normal. As long as the tank or pump itself isn't leaking then you are worried about nothing. The tank is pretty big. You'd have to use a helluva lot of fluid to empty it. And then the warning light would come on.
    ASE and BMW Master Certified Technician

  3. #3
    Join Date
    Jan 2004
    (northeast) Indiana
    My Cars
    13 650ix GC & 06 X5 4.4i
    Are you getting a low washer fluid level warning? If not, would carrying a gallon of washer fluid in your trunk help ease your fear of running out? You can get a gallon of windshield washer fluid for not much (like Walmart etc) unless you are more inclined to use the BMW washer concentrate etc.

    When the low fluid light does does so prior to the reservoir being completely stopping to get fluid to replenish...or if you do keep a gallon in your trunk or in your should be able to refill with no issue.

    If you are getting the low washer fluid warning after just refilling and driving around for a bit...then your real issue may be a failed washer fluid reservoir lid. This has actually been an issue that has been discussed across multiple BMW forums. The new engines (especially turbo) create a lot of heat and if the seal on the reservoir lid has failed...the washer fluid is evaporating.

    Some have been confounded by this fast loss of fluid...but some start lifting their hoods and noticed condensation on the hood above the washer well as around the reservoir lid. And replacing the lid has fixed their issue. Here's a link to a 2016 thread that discussed/discovered this oddity:
    Last edited by Qsilver7; 11-14-2019 at 11:17 AM.
    (if my grammar, spelling, or sentence structure is screwed up....don't blame's my dang bluetooth keyboard...I try to catch & correct the mistakes...but I may not catch all of them.)

    Q {BMW CCA Member #191509}
    2013 650ix GC (Black Sapphire) 1/13 mfg date <<~>> 2006 X5 4.4i (Sterling Gray) 12/05 mfg date

    (Past BMWs)
    1997 740iL (Arctic Silver) <<~>> 1999 540iT (Orient Blue) <<~>> 1995 525iT (Alpine White) 1991 735iL (Schwarz) <<~>> 1985 325e (Bronzit)

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