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  #1  
Old 03-05-2013, 05:01 PM
WillRoger WillRoger is offline
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Location: Toledo OH
 
Join Date: Mar 2013
Posts: 2
Mein Auto: 2008 535xi
No Heat, temperature warning

2008 535xi CPO- what i have is probably (hopefully) just a classic case of a failed thermostat.
After a couple of minutes of driving, i noticed the air blowing through the vents wasn't getting warmer. shortly after that, i heard the engine fan kick on. another mile and i received a high temperature warning. luckily i was only a few blocks from home. car has 68K miles. can this be more than just a thermostat?
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  #2  
Old 03-05-2013, 05:16 PM
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Fast Bob Fast Bob is offline
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Location: Here, there, everywhere....
 
Join Date: Jun 2004
Posts: 33,908
Mein Auto: 2004 330Ci ZHP 3 pedals
Sounds more like a low-coolant condition....a T-stat stuck open would give you a "no heat" situation, but no overheating....conversely, the temp gauge would tend to stay down near the blue zone, probably generating a CEL as well.
A T-stat stuck in the CLOSED position would be *immediately* apparent....it would overheat *real*fast, and you would be able to bleed off some of the excess heat by running the heater on full blast.
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  #3  
Old 03-05-2013, 05:32 PM
WillRoger WillRoger is offline
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Location: Toledo OH
 
Join Date: Mar 2013
Posts: 2
Mein Auto: 2008 535xi
Thanks Bob,
i'm taking her in tomorrow for service.
ditto on Wounded Warrior
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  #4  
Old 03-05-2013, 05:32 PM
Klamalama Klamalama is offline
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Location: North East, MD
 
Join Date: Oct 2007
Posts: 223
Mein Auto: 330i, C230K, 3.2CLS-6
My educated guess is that you've lost all your coolant from a substantial radiator leak. Mine split at the crimp between the aluminum and plastic. Same symptoms. Open the coolant reservoir cap and you'll see zero coolant. Pour water into the radiator and watch it leak out. You're getting no heat because there is no coolant.
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Last edited by Klamalama; 03-05-2013 at 05:34 PM.
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