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Thread: Losing coolant at an alarming rate...

  1. #1
    Unregistered Guest

    Default Losing coolant at an alarming rate...

    but nothing is leaking from the car, I just filled the coolant 2 days ago and its already telling me my coolant is low. I checked and it is really low, probably lost over 1/4 since filling it. Does anybody know what could be going on. Also the car tends to cut out on me when my A/C is on. Even when im moving! I was in traffic in 3rd gear and the car cut off! twice! its starting to scare me. Any insight would be appreciated. I have a '90 525i

  2. #2
    Join Date
    Dec 2003
    Location
    Lincoln, NE
    Posts
    559

    Default

    Well, there are only so many places coolant can go... so if it's not leaking on the ground, and not leaking onto your carpeting....it's time to check the headgasket. Better get a compression/leakdown/exhaust analysis test quick, in case you haven't warped/cracked you head yet!

  3. #3
    Unregistered Guest

    Default damn you got me scared now

    im gonna look into getting it tested, thanks

  4. #4

    Default

    i had a coolant problem. i haver a 92 525i and we put a new waterpump in a new thermostat and we plushed the whole system. turns out it was the radiator cap. i would lose alot of coolant also my a/c would shut off by itself sometimes also but it doesnt now

  5. #5
    Join Date
    Dec 2003
    Location
    baton rouge, loserana
    Posts
    6,922

    Default

    if it's pumping that much coolent you should be able to see it by looking at the spark plugs, the one that's getting the water will be cleaner then the others, through steam cleaning
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  6. #6
    Join Date
    Jan 2004
    Location
    SF Bay Area, CA
    Posts
    115

    Default Yes - try replacing the reservoir cap.

    that solved coolant loss on my 733.
    used a cap that said "140" on it (from 88 M5).
    old cap said "100"

  7. #7
    Join Date
    Jan 2004
    Posts
    4,148

    Default Mike the 100 means that the pressure at which the cap would

    popoff and release the pressure to the outside dump tube is
    1.00 bars.. or 14.5 psi... the 140 opened at 1.4 bars or 20.3 psi...
    The newer e34's all have caps that open at 2.00 bars or 29.00 psi so the newer ones are already at a much higher pressure... Although I think that the redesigned recall caps release at a lower pressure than the 2 bars to keep the heater core from really letting go on a overheat...









    Quote Originally Posted by mike wong
    that solved coolant loss on my 733.
    used a cap that said "140" on it (from 88 M5).
    old cap said "100"

  8. #8
    Join Date
    Dec 2003
    Location
    Wellington,New Zealand
    Posts
    3,868

    Default it is usual to NOT see any leaks

    because quite often the coolant loss only takes place when the system is up to full pressure...I had a hose that was split almost its whole circumference.Only by looking really carefully did i see brightly coloured(insert blue or green here) fluid trapped in some casting relief areas....Check all your hoses by squeezing em..if you hear any hissing or slurping sounds NOT from the expansion tank area,you have found your problem but it could be the water pump too.......
    Gone but not forgotten

  9. #9
    Unregistered Guest

    Default new guy

    i had same problem and a pressure check by the local shop revealed a cracked head

  10. #10
    Unregistered Guest

    Default visitor

    Check your engine oil for coolant mixture (brown color). One way to find out if you have a cracked or blown head gasket. Good luck...

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