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Thread: flushing the coolant system

  1. #1

    Default flushing the coolant system

    i just bought Prestone flush 'n fill kit to flush the coolant systems but im not sure which hoses to connect the back flow preventer coupler. anybobdy done this before please advise. thanks

  2. #2
    Join Date
    Mar 2005
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    TORONTO
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    Though I can't help you... be prepared for the flak of refilling with Prestone green!
    :: HIDCanada.com | Illuminating Your World


  3. #3
    Join Date
    Jul 2005
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    North SF bay area Delta region
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    Default

    Quote Originally Posted by kwamek
    i just bought Prestone flush 'n fill kit to flush the coolant systems but im not sure which hoses to connect the back flow preventer coupler. anybobdy done this before please advise. thanks
    I don't think those kits are recommended for cars with auxillary water pumps. (no idea what car you have. since it's not listed).

    I just flushed my 525i by draining the radiator, and with the drain left open.I then disconnected the upper radiator hose, at the radiator. I then ran the motor with the heater on 'full heat' setting. As you keep adding water from the garden hose to the expansion tank, the old coolant flushes from the cooling system through the disconnected upper Rad. hose.
    After everything was running clear with no traces of foam. I did a final flush with 4 gallons of distilled water. ( Our Albertsons is closing too. I got 4, 2 gallon jugs of distilled water for $2.50 ) .. I then let some more water run out of upper Rad. hose. Turn off motor, Let Rad drain/ Close drain fitting, connect upper hose and added 5 Qt. of BMW blue, and top off with distilled H2O.
    Get the system to operating Temp. Bleed cooling system....Done
    I did'nt even have add coolant mix after test drive, and system cooled......
    1991 525i M50 5 Sp.
    N.California

    America is all about speed. Hot, nasty, badass speed. -Eleanor Roosevelt

  4. #4
    Join Date
    Mar 2006
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    811

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    If the system has not been abused, all yo need to do is drainthe engine and the radiator and refill it. otherwise, unplug all the hoses and flush in every direction with a garden hose until it runs clear.

  5. #5
    Join Date
    Oct 2004
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    Honolulu
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    3,105

    Default Yup, the old hose

    works the best, just disconect the radiator and flush away!

    Run the heater to clear the core.

    Fill witn BMW blue and the world is in harmony.


    Vee ave vays of dealing vid your kind...........

  6. #6

    Default

    bmw 1992 525i model
    thanks a lot for the help.



    Quote Originally Posted by Chris'91'525i
    I don't think those kits are recommended for cars with auxillary water pumps. (no idea what car you have. since it's not listed).

    I just flushed my 525i by draining the radiator, and with the drain left open.I then disconnected the upper radiator hose, at the radiator. I then ran the motor with the heater on 'full heat' setting. As you keep adding water from the garden hose to the expansion tank, the old coolant flushes from the cooling system through the disconnected upper Rad. hose.
    After everything was running clear with no traces of foam. I did a final flush with 4 gallons of distilled water. ( Our Albertsons is closing too. I got 4, 2 gallon jugs of distilled water for $2.50 ) .. I then let some more water run out of upper Rad. hose. Turn off motor, Let Rad drain/ Close drain fitting, connect upper hose and added 5 Qt. of BMW blue, and top off with distilled H2O.
    Get the system to operating Temp. Bleed cooling system....Done
    I did'nt even have add coolant mix after test drive, and system cooled......

  7. #7
    Join Date
    Dec 2003
    Location
    baton rouge, loserana
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    6,913

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    the block drain is a 19mm bolt by the exhaust manifolds, it's about at the 4th cylinder. green coolent won't hurt anything imho but as with any coolent it should be changed about every two years for maximum corrosion protection, for the record i see just as much crumbling plastic with the blue coolent verses the green if not more, i don't like how the blue coolent changes the color of everything

    Quote Originally Posted by kwamek
    bmw 1992 525i model
    thanks a lot for the help.
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  8. #8
    Join Date
    Jul 2005
    Location
    North SF bay area Delta region
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    Default

    Quote:
    Originally Posted by Chris'91'525i
    ******************************
    I don't think those kits are recommended for cars with auxillary water pumps. (no idea what car you have. since it's not listed).

    I just flushed my 525i by draining the radiator, and with the drain left open.I then disconnected the upper radiator hose, at the radiator. I then ran the motor with the heater on 'full heat' setting. As you keep adding water from the garden hose to the expansion tank, the old coolant flushes from the cooling system through the disconnected upper Rad. hose.
    After everything was running clear with no traces of foam. I did a final flush with 4 gallons of distilled water. ( Our Albertsons is closing too. I got 4, 2 gallon jugs of distilled water for $2.50 ) .. I then let some more water run out of upper Rad. hose. Turn off motor, Let Rad drain/ Close drain fitting, connect upper hose and added 5 Qt. of BMW blue, and top off with distilled H2O.
    Get the system to operating Temp. Bleed cooling system....Done
    I did'nt even have add coolant mix after test drive, and system cooled......

    Quote Originally Posted by kwamek
    bmw 1992 525i model
    thanks a lot for the help.
    No problem,
    I've used this method for many years, on all types of vehicles.
    Takes about a half hour, but does a very thourough job.

    I found when doing the final bleeding of this system, once it gets up to operating Temp. and system is nearly full.
    I held the engine revs at a pretty high (2-3K). I then completely filled expansion tank to the very top, and quickly screw the radiator cap on.(put it back to idle after cap is back on).......
    Then I bleed the air out.
    After a test drive and it cooled completely, the coolant level was right at the cold fill mark on expansion tank.

    Note: correct me if I'm wrong. But not sure if you should keep the Revs up while doing this with an automatic tranny. Thought I read you can't Rev stationary BMW's with auto trans.....
    1991 525i M50 5 Sp.
    N.California

    America is all about speed. Hot, nasty, badass speed. -Eleanor Roosevelt

  9. #9
    Join Date
    Jan 2006
    Location
    Toronto, Canada
    Posts
    8

    Default

    i want to try a coolant flush myself...but where is the drain fitting for the rad...is it under the rad? i have no clue whatsoever so a good description would be great.

    thanks.

  10. #10
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,685

    Default

    bottom inside of the rad under the splash shield.
    Quote Originally Posted by mastermind
    i want to try a coolant flush myself...but where is the drain fitting for the rad...is it under the rad? i have no clue whatsoever so a good description would be great.

    thanks.
    95 E34 530I V2.31
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

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