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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 05-20-2015, 08:20 PM
carls540i carls540i is offline
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Location: atlanta
 
Join Date: Jul 2014
Posts: 41
Mein Auto: BMW 540i
erratic temperature gauge

I have an 02 540i and occasionally my temp gauge goes above the 1/2 way point approaching red th ed n comes back down after maybe 20- 30secs. Tonight it approached the red and my coolant warning,light came on,but it went back down to half after a few minutes. Ive been checkingthe coolant in the morning and have been replenshing when needed. Dont see any leaks,also just had the timing and head done but this has been happening prior to the work done. Hasnt been overheating just seems to get hot and coming b ack down. could this be a sign for a coolant flush?Any suggestion advice would be great.

Thanks
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  #2  
Old 05-20-2015, 08:36 PM
lucio2 lucio2 is offline
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Location: san diego
 
Join Date: May 2015
Posts: 7
Mein Auto: 2001 530i
Hi carls540i,

I've had an almost identical issue with my 2001 530i. When this occurs it typically throws code P0117(Engine coolant temp sensor low input). It always seems to occur on the freeway. I've replaced the entire coolant system including both temp. sensors but it still does it. Let me know if you find the root cause of this problem and solve it.
Thanks,
Marc
"m_facchini@yahoo.com"
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  #3  
Old 05-20-2015, 10:26 PM
ca2014mp2 ca2014mp2 is offline
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Location: San Jose
 
Join Date: Jul 2014
Posts: 182
Mein Auto: E39 528ITA
first make sure it is bled correctly and then your next stop is to prove the T-stat is working correctly....
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Series E39 Vehicle code DP63 Model 528ITA Engine M52TU
Body type OTHER Catalog model USA Production date 1999 / 06
Transmission Automatic Steering Left Catalyzer YES

Production FROM : 1998/09/01 TO : 1999/08/31
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  #4  
Old 05-20-2015, 11:53 PM
E39Hoon E39Hoon is offline
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Location: San Diego
 
Join Date: Jun 2012
Posts: 191
Mein Auto: 97 E39 528i, 89 E30 325i
Quote:
Originally Posted by ca2014mp2 View Post
first make sure it is bled correctly and then your next stop is to prove the T-stat is working correctly....
Yeah keep on bleeding out the air. It's a pain. I've had the same issue before.
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  #5  
Old 05-21-2015, 04:30 AM
sixpot_simon's Avatar
sixpot_simon sixpot_simon is offline
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Location: Australia
 
Join Date: Sep 2013
Posts: 676
Mein Auto: E39 530i
For some more info to narrow down the fault, use the Ktemp option in the Secret Menu. That way, you can see if it's just the gauge going crazy.

If the gauge is swinging rapidly, I suspect the problem is in the gauge. The gauge is heavily buffered, so even a quickly varying coolant temp is unlikely to cause rapid movement of the needle.

EDIT: So you're losing coolant? (the regular top-ups)
Best get a pressure test done, to see where it's going.
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E39 wiki updated with bestlinks: http://www.bimmerfest.com/wiki/index.php/BMW_E39

Last edited by sixpot_simon; 05-21-2015 at 04:38 AM.
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