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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

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 10-01-2012, 06:23 AM
mr magoo mr magoo is offline
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Location: south of Boston
 
Join Date: Mar 2010
Posts: 55
Mein Auto: 2000 528i
Coolant Level Sensor performance

The seam on my 2000 528i radiator let go on my way home from work Fri nite. I saw slight steam but by temp sensor read normal until 1/2 mile from home and moved quickly to red as I shut it off in my driveway. I saw no low coolant warning. I will replace the level sensor in the expansion tank as part of the upcoming overhaul, but my question is this: If the sensor is faulty, shouldn't I get a warning?

Thanks for looking and sharing any experience, fact or opinion.

Also, I am buying many overhaul parts today and am near info paralysis after reading Bluebee's compilations of analysis. They are a golden treasure, but formidable to us amateurs. (Thank you, Bluebee.), but please feel free to throw in any additional cooling sys rehab advise.

Mike
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  #2  
Old 10-01-2012, 07:07 AM
jygesq jygesq is offline
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Location: Bloomfield, CT
 
Join Date: May 2003
Posts: 1,239
Mein Auto: 2000 528 MT
there is no coolant light on year 2000

there is in icon on the dash panel but it is not functional. I have the same year car and have done extensive research on that issue. There is no sensor in the expansion tank, only a float with nothing attached to it. only electronic warning is on the temp gauge that car has overheated.

Last edited by jygesq; 10-01-2012 at 07:11 AM.
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  #3  
Old 10-01-2012, 07:22 AM
pshovest pshovest is offline
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Mein Auto: '10 535iA, '00 528iTM
Cars with the Low OBC don't get the low coolant level indication.
You can retrofit the low coolant sensor and splice it into the washer fluid level sensor wiring, takes about 45 minutes. Now you'll get the low washer fluid light when coolant or washer fluid are low.
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  #4  
Old 10-01-2012, 07:27 AM
mr magoo mr magoo is offline
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Location: south of Boston
 
Join Date: Mar 2010
Posts: 55
Mein Auto: 2000 528i
Thank you

Thank you for your replies and the WW level trick. Maybe someone has done a DIY. I will search
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  #5  
Old 10-01-2012, 09:30 AM
pleiades pleiades is offline
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Mein Auto: '99 528i, M52TU w/stick
"Oh Mr Magoo, you've done it again!! "

The coolant level sensor on the bottom of your expansion tank could be the culprit, or... the sliding floater inside the tank itself could have been stuck in a high position. Apparently the sensor uses a magnet to measure the location of the floater. If the floater is stuck, I'm not sure you can do anything about it other than buy a new exp. tank. Go genuine BMW if you do. Discounting S&H, the cost of getting one from the dealer is not going to be much "worse."
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Old 10-01-2012, 09:39 AM
ndz ndz is offline
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Mein Auto: 99 540iT, 00 528i/5
Quote:
Originally Posted by pshovest View Post
Cars with the Low OBC don't get the low coolant level indication.
This was my understanding. I don't think my 2000 528i/5 w/ low OBC has a coolant level sensor.
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00 528i/5 - Grüen Arrow
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00 740iL (R.I.P.)
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  #7  
Old 10-01-2012, 10:56 AM
pleiades pleiades is offline
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Mein Auto: '99 528i, M52TU w/stick
Quote:
Originally Posted by ndz View Post
This was my understanding. I don't think my 2000 528i/5 w/ low OBC has a coolant level sensor.
Really? No coolant level sensor on a model-year 2000 e39? No sensor plugged into the bottom of the expansion tank?
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