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E60 (2004 - 2010)
BMW 5-Series (E60 chassis) was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E60 is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

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  #1  
Old 03-30-2012, 07:24 AM
pcy pcy is offline
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Location: Boston
 
Join Date: Sep 2011
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Mein Auto: '06 530i, '07 C280, ML320
o-ring at coolant temp sensor

Hi,

While I had the control arm bushings replaced on my '06 530i, yesterday, I noticed coolant leak on the coolant return hose [at the radiator return line]. I looked from above and I saw traces of coolant on the coolant temp sensor as well. I am thinking the leak is from the o-ring on the temp sensor. It doesn't look like o-ring is available separately. Anyone replaced just the o-ring on the coolant temp sensor?

This picture is taken from under the car.
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  #2  
Old 03-30-2012, 10:43 AM
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boramkiv boramkiv is offline
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Location: Chesapeake, VA
 
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Mein Auto: Some Bavarian car outside
I dont think the oring is sold separate from the sensor. I looked all over for it and even according to realoem its one piece even for other BMW models. Most bmws use the same exact sensor and dirt gets in there (somehow) and ruins the oring causing a leak. I was able to get a perfect size oring from a local hardware store. The sensor itself is about $25 if you want to go that route.
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  #3  
Old 03-30-2012, 10:58 AM
pcy pcy is offline
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Mein Auto: '06 530i, '07 C280, ML320
boramkiv, thanks for your feedback.

I hate to throw away good working temp sensor just because of bad o-ring. Do you happen to remember the size of the o-ring you bought at the store?
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Old 03-30-2012, 11:22 AM
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boramkiv boramkiv is offline
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Location: Chesapeake, VA
 
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Mein Auto: Some Bavarian car outside
I cannot remember. I took the sensor in with the old compressed oring to a Tayor's home center. They have a huge oring inventory. It didnt cross my mind to remember the size I just grabbed three of them. It was a lucky guess for me.
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Old 03-30-2012, 11:26 AM
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boramkiv boramkiv is offline
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Check this out:

http://www.bimmerfest.com/forums/sho...d.php?t=474027

I saw this afterwards. I have to admit you gotta love bluebee!!

Last edited by boramkiv; 03-30-2012 at 11:29 AM.
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  #6  
Old 03-30-2012, 12:37 PM
pcy pcy is offline
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Mein Auto: '06 530i, '07 C280, ML320
Thanks for that info.
I went to BMW dealer to get that o-ring, they didn't have that o-ring in stock. I ordered one.
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