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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 07-05-2014, 07:51 PM
aioros aioros is offline
aioros
Location: Wildomar, CA
 
Join Date: Feb 2009
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Mein Auto: '99 528i auto , '01 330xi
coolant temp reached 111C

during a ride in my home town where the outside temp was 107 F, the coolant temp reached was a steady 108C, also reaching 111C for a few secs.
will that temp do any harm to the engine?

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  #2  
Old 07-05-2014, 08:15 PM
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helmet75 helmet75 is offline
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Mein Auto: 2000 528i 9/99
as long as you didnt hit the red on the gauge you should be okay.
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  #3  
Old 07-05-2014, 08:41 PM
alex5er alex5er is offline
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Mein Auto: e39 1997 528i
When was the last time you had your coolant change.? Not a bad idea if you have no idea if it was ever change.


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Old 07-05-2014, 08:46 PM
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QSilver7 QSilver7 is offline
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Mein Auto: 1997 740iL / 2006 X5 4.4
Ditto...above...and as long as you either turn the engine off before you go into the red...or the coolant temp starts to drop...you should be ok. It's when owners see the needle go into the red and the check control warning comes on...and they continue to drive with all this going on...are the ones that usually end up doing damage.

Plus...the aux fan is designed to facilitate reducing the coolant temperature when it reaches those temps...its not just for the AC system. As you can see in the info below...when coolant temps reach 120 C (this is when the needle is in the red danger zone) the variable speed aux fan will run at it's highest speed in an attempt to bring the coolant temp down:


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99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
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  #5  
Old 07-06-2014, 09:56 AM
aioros aioros is offline
aioros
Location: Wildomar, CA
 
Join Date: Feb 2009
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Mein Auto: '99 528i auto , '01 330xi
i changed the coolant a couple of months ago, drain 'n fill with Evans NPG which it was in the engine already. i didnt know the coolant temp could reach 120C without doing any damage to the engine. 111C is the highest temp i have seen in my car.

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  #6  
Old 07-06-2014, 10:44 AM
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golferjohnm golferjohnm is offline
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Did you notice if the aux fan kicked in? I recently completed a full cooling system overhaul and I now run 109-110 degrees celcius and the aux fan starts a slow whir at 111 degrees...I have not heard my fan go to the highest speed ever
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  #7  
Old 07-06-2014, 11:08 AM
pleiades pleiades is offline
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Quote:
Originally Posted by golferjohnm View Post
Did you notice if the aux fan kicked in? I recently completed a full cooling system overhaul and I now run 109-110 degrees celcius and the aux fan starts a slow whir at 111 degrees...I have not heard my fan go to the highest speed ever
^This. aioros, your 6-cyl car shouldn't be reading that high. One of your cooling fans may not be functioning as it should, or your tstat is un-right.

BTW, not running it now but I had Evans in my '99 for 18 months and never saw the temp reading top 97 C that whole time.
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  #8  
Old 07-07-2014, 05:49 AM
aioros aioros is offline
aioros
Location: Wildomar, CA
 
Join Date: Feb 2009
Posts: 582
Mein Auto: '99 528i auto , '01 330xi
Quote:
Originally Posted by golferjohnm View Post
Did you notice if the aux fan kicked in? I recently completed a full cooling system overhaul and I now run 109-110 degrees celcius and the aux fan starts a slow whir at 111 degrees...I have not heard my fan go to the highest speed ever
the aux fan didnt stop spinning, matter of fact, it starts spinning around 102. besides the ac was running all the time. The outside temp was 108F with high humidity but it felt like if it was 120F. the car's outside temp reader showed 118F
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  #9  
Old 07-07-2014, 05:54 AM
aioros aioros is offline
aioros
Location: Wildomar, CA
 
Join Date: Feb 2009
Posts: 582
Mein Auto: '99 528i auto , '01 330xi
Quote:
Originally Posted by pleiades View Post
^This. aioros, your 6-cyl car shouldn't be reading that high. One of your cooling fans may not be functioning as it should, or your tstat is un-right.

BTW, not running it now but I had Evans in my '99 for 18 months and never saw the temp reading top 97 C that whole time.
usually, the coolant temps read between 96-104C, in southern california weather with the ac running on city streets. freeway speeds, the coolant is very steady at 98C
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