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6 Series DIY
6 Series Do It Yourself (DIY) forum.

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  #1  
Old 11-17-2013, 05:20 PM
Con645 Con645 is offline
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Location: Ontario, Canada
 
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Mein Auto: 2005 BMW 645ci
Unhappy 2005 645 front passenger side leak.. help?

Hey guys,
The last couple days shes been leaking what tastes like antifreeze from under the front passengers side, slightly behind the wheel well cant really tell where its coming from due to all the shielding. Just wanted an idea of what I may be getting myself into before I started tearing her apart. Any ideas?

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  #2  
Old 11-17-2013, 11:26 PM
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Yorgi Yorgi is offline
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The expansion tank for the coolant is up front on the passenger side and it is a very common fail item - it's a matter of when, not if, it will fail. Look for cracks in the tank, sometimes it will leak only when the system is hot and under pressure.
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Old 11-18-2013, 02:30 PM
Con645 Con645 is offline
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Thanks Yorgi!
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Old 03-17-2014, 11:30 PM
BMW645CA BMW645CA is online now
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Hey Yorgi- I notice that my vehicle just started to do that this morning, could this be the reason why my vehicle is overheating? Thanks for all the help thus far..

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Old 03-18-2014, 09:59 AM
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Yorgi Yorgi is offline
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Originally Posted by BMW645CA View Post
Hey Yorgi- I notice that my vehicle just started to do that this morning, could this be the reason why my vehicle is overheating? Thanks for all the help thus far..

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Yes, loss of coolant pressure would explain the ~ 10F higher than normal temps you are seeing.

Take a look at post #8 in this thread and make sure you are not seeing coolant leak from that small hole in picture 2. If you see coolant coming out the weep hole you have the dreaded "coolant pipe" leak ($2K repair). If it's an expansion tank issue that is a few hundred to fix.
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Old 03-24-2014, 06:49 PM
drbbop drbbop is offline
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And if you have any luck, it is the inline sensor that is close the to the right large hose at the front right paaenger side of the radiator
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Old 03-24-2014, 07:55 PM
BMW645CA BMW645CA is online now
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Thanks for the feed back.. I check that sensor and I also replace it too just in case.. I also added the radiator stop leak liquid. It seemed to have done the job but my engine is still running at a 245 f. And it only goes done when im not pressing on the gas.. kindoff like when im making a turn ocoming of the free way..

Other than that the tempature keeps rising while im driving.. the over heat message hasent come up thought( atleast not yet)

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