Volvo RWD 900 Forum

INDEX FOR 2/2026(CURRENT) INDEX FOR 8/2023 900 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

too much antifreeze??? 900

posted by  the kick inside on  Thu Jan 30 09:48 CST 2003
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Thu May 17 09:58 CST 2007
[RELATED]

just had the turbo done, talked to the mech today.. he had a little problem, when he refilled the coolant he droppedi nthe 5ltrs volvo anitfreeze i had provided, then could only get another ltr or so of water in...turned out he hadnt drained the block...

so im guessing im now running 75% antifreeze...can this do any harm???

cars a 945turbo btw








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    too much antifreeze??? 900

    posted by  the kick inside on  Fri Jan 31 07:47 CST 2003
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Thu May 17 09:58 CST 2007
    [RELATED]

    ta guys, pretty much confirmed my thoughts...

    think i will leave it for now let everything settle down a tad then pull a couple of litres out and water it down sum...

    anyone see any reason why i cant bottle the stuff i take out and shelf it for future use (eg when i pull a hose and spill some...)?







  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    too much antifreeze??? 900

    posted by  chris herbst on  Thu Jan 30 14:34 CST 2003
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Mon Oct 20 20:32 CST 2014
    [RELATED]

    I always work off of the bottles. Typical recommendation is to have around 70/30 antifreeze/water. As I recall, that approximate number gives better performance when cold and hot, than does 50/50. I could be off, but I've read a lot of AF bottles just to make sure.
    --
    Chris Herbst, near Chicago.








  •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

    too much antifreeze??? 900

    uid 1255's pic
    posted by  Philip Pan on  Thu Jan 30 13:00 CST 2003
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Wed Sep 19 05:58 CST 2007
    [RELATED]

    Besides what the other guys already said, the extra-thick coolant will make your water pump and motor work harder. In hot weather, that can also contribute to overheating. Some of the coolant passages in the block are pretty small. I'd go ahead and drain some and thin it out to 50% (or whatever ratio is recommended).
    --
    '84 '285' rice-eater with lotsa hp & performance goodies








  •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

    too much antifreeze??? 120-130

    posted by  walrus3 on  Thu Jan 30 11:56 CST 2003
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Mon Dec 2 14:20 CST 2013
    [RELATED]

    Depends on how cold it gets where you are. After you get beyond 70%
    the freezing point starts coming back up.

    30% freezes @ +4°F
    40% @ -12°F
    50% @ -34°F
    60% @ -62°F
    70% @ -84°
    100%@ ~0°F
    --
    George Downs, The "original" Walrus3, Bartlesville, Oklahoma








  •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

    too much antifreeze??? 900

    posted by  rhaire on  Thu Jan 30 11:48 CST 2003
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Mon Aug 4 10:16 CST 2014
    [RELATED]

    Well he should have known enough to at least flush it to reduce the residual to water. At 75% ethylene glycol you have reduced cooling efficiency as well as raised the freezing point of the mixture, neither of which are good. I am not sure if 75% will mean anything practically but you could drain a couple of liters and add water.








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      too much antifreeze??? 900

      posted by  invar on  Thu Jan 30 11:51 CST 2003
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Fri Feb 26 21:00 CST 2010
      [RELATED]

      while you're right about cooling efficiency being reduced, freezing point has NOT been raised. it's been lowered. meaning it's more difficult for stuff to freeze. any solute that is added to water will lower its freezing point. (freezing point depression)

      you won't really harm anything by having 75% in your car during the winter. just keep an eye on the gauge during the summer. if it becomes a problem, drain some and refill it with water... or drain and flush the entire system.

      edit:
      apologies to rhaire. you were right, ethylene glycol+water's freezing point is is dependent on concentration. guess i do learn something new every day. :)

      http://www.gi.alaska.edu/ScienceForum/ASF6/680.html
      --
      Kenric Tam
      1990 Volvo 740 base sedan (B230F)
      My Volvo 'Project'








      •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

        too much antifreeze??? 900

        posted by  rhaire on  Thu Jan 30 12:55 CST 2003
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Mon Aug 4 10:16 CST 2014
        [RELATED]

        Thats why I don't use glacial acetic acid in my car, check out that freezing point! I think it is around + 40F, if I recall.







<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.