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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 02-18-2013, 06:22 PM
fortunateson fortunateson is offline
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Location: New Westminster, BC
 
Join Date: Jan 2009
Posts: 250
Mein Auto: 525i
Exclamation Engine UNDER heating?

For the last couple of weeks I've noticed that my temp guage stays below the mid-point which it always reached before. I did have to top off the coolant by about a pint. SO... low coolant level preventing it from reaching operating temp? I would think it would overheat if this was the case. Any ideas? Don't seem to see any white exhaust so I don't think I'm burning coolant. Outside temps have been from upper 30's to mid 40's.
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  #2  
Old 02-18-2013, 06:26 PM
cn90 cn90 is offline
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Location: Omaha NE
 
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Posts: 12,739
Mein Auto: 1998 528i 5-sp 140K+
Replace tstat (Wahler or BMW only).
Then review your cooling system service records.
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Old 02-18-2013, 06:34 PM
fortunateson fortunateson is offline
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Location: New Westminster, BC
 
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Mein Auto: 525i
Replaced the the t-stat about 3 years ago with brand recommended on this forum. Any other ideas?
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  #4  
Old 02-18-2013, 07:26 PM
StLMO StLMO is offline
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Location: St. Louis
 
Join Date: Jan 2013
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Mein Auto: 535i
I recently purchased a car with the same exact issue. I'm not 100% on the other 5 series thermostats, but when the thermostat on an M5 fails, it stays open causing the car to run cool. My indy shop told me that it's not good for the car since the car stays in an open loop and will run rich. Any shop will be able to diagnose for you when the car warms up to know if it's definitely it. Good luck.
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  #5  
Old 02-18-2013, 07:58 PM
fortunateson fortunateson is offline
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Location: New Westminster, BC
 
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Posts: 250
Mein Auto: 525i
I just can't believe that a t-stat wouldn't last 4 years! I'll check it out.
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  #6  
Old 02-18-2013, 11:27 PM
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bluebee bluebee is offline
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Location: San Jose, California
 
Join Date: Mar 2008
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Mein Auto: 02 BMW 525i M54 auto 130K
I'd start with how the thermostat works under normal conditions:
- What is the temperature of the coolant & when the thermostat opens under normal conditions (1)
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See also: E39 Bestlinks & How to easily find what you need
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