Results 1 to 7 of 7

Thread: How to change coolant?

  1. #1
    Join Date
    Jan 2007
    Location
    Rochester Hills, MI - Montenegro!
    Posts
    954
    My Cars
    BMW 528iA

    How to change coolant?

    I have this 528i and I think it's time to change coolant.
    I saw the system is under the pressure, after driving.

    P.S. my radiator is Nissens Made in Denmark.

    What you guys thing, which coolant is the best and how to do it, how to flush it?

    Thanx.
    Last edited by BMW 528; 10-25-2007 at 05:29 AM.

    BMW 528i Automatic - Premium and Winter Package - Avital Remote Starter - XM Satellite Radio - e60 wheels - LPG

  2. #2
    Join Date
    Dec 2004
    Location
    Huntsville, AL
    Posts
    25,844
    My Cars
    87 325is
    The safe bet is BMW coolant mixed 50:50 with distilled water. To change the coolant drain the system from the radiator and block drains, refill with fresh, and bleed the system. The bleed procedure I use is:

    1) Using ramps or a jack get the front of the car 1' or more higher than
    the rear. That will make the radiator and bleed screw the highest point
    on the engine and facilitate removal of air.

    2) With the bleed screw open, add coolant until no more air comes out of
    the bleed.

    3) Leave the filler cap off, or at least loose, and set the heat for max
    temp and fan speed. Leaving the cap loose will prevent air that's still
    in the system from causing a "coolant fountain" once the engine heats
    up. Start the engine and allow it to warm up to operating temp. As it
    warms up occasionally crack the bleed screw to release any air and top
    up the coolant as necessary.

    4) Once the engine is at temp bring it up to 2000-2500 for a few seconds
    several times. Then crack the bleed until no more air is released. At
    this point the heater should be throwing lots of hot air, which
    indicates that the heater core is filled with coolant. You may have to
    repeat this a few times to get all the air out.

    5) Drive the car a bit, allow it to cool back down, and recheck the
    bleed for air. Over the next few days you may get very small amounts (a
    few bubbles) of air out of the bleed screw.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

  3. #3
    Join Date
    Jan 2004
    Location
    (northeast) Indiana
    Posts
    17,831
    My Cars
    97 740iL & 06 X5 4.4i
    Save these two websites to your favorites folders...a lot of maintenance & upgrade/mod write-ups and tutorials have been archived for you to use at anytime you may need them...not sure if they have a coolant flush procedure listed...but lots of other stuff is there:
    (if my grammar, spelling, or sentence structure is screwed up....don't blame me...it'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}
    1997 740iL (Arctic Silver) 3/97 mfg date <<~>> 2006 X5 4.4i (Sterling Gray) 12/05 mfg date
    (SOLD)
    1999 540iT (Orient Blue) <<~>> 1995 525iT (Alpine White)
    1991 735iL (Schwarz) <<~>> 1985 325e (Bronzit)

  4. #4
    Join Date
    Jan 2007
    Location
    Rochester Hills, MI - Montenegro!
    Posts
    954
    My Cars
    BMW 528iA
    Thank you guys.

    I did this today, I bought just 3 litres OMV antifreeze to our BMW dealer (that's what the using) and 6 litres dest. water.
    They didn't have more than 3 litres!!!
    I think I have to buy 2 more litres.

    But, again system is under the pressure and temp is 93 C celsius. Is that OK?

    BMW 528i Automatic - Premium and Winter Package - Avital Remote Starter - XM Satellite Radio - e60 wheels - LPG

  5. #5
    Join Date
    Sep 2006
    Location
    Lone Star State
    Posts
    4,417
    My Cars
    2003 BMW 540i M-Tech
    The system should be under pressure. That has nothing to do with the quality/age/etc. of your coolant.

  6. #6
    Join Date
    Jul 2007
    Location
    Aukland
    Posts
    3,859
    My Cars
    99 528i 15 Corvette Z51
    Like with a pressure cooker, the more pressure the system has the higher the boiling point is, boiling point is usually 212f or 100c with 15 lbs of pressure, as in our system, the boiling point is more like 230 or so.
    My 528 is a German Tank..
    My 2008 Chihuahua is Blue deal with it
    Always teaching now getting paid for it.

  7. #7
    Join Date
    Oct 2007
    Location
    Owatonna, Mn
    Posts
    43
    My Cars
    1999 528i
    Try going to Pelican Parts and look this up in their technical section. They have a decent article complete with photos for reference.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •