Thread: Coolant leak
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Old 11-06-2011, 08:34 AM
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Yorgi Yorgi is offline
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Join Date: Mar 2005
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Mein Auto: '04 M3 / '06 650i Cab
If you think you can quickly pull and replace the sensor without draining the system then it would not hurt to try changing just the o-ring.

I would try the new o-ring, refill the system and if it still leaks grab a new sensor from the dealer ($25) tomorrow and replace it without draining the system.

Here is a shot of what a new sensor looks like if you want to see how thick the o-ring should be for reference.
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Last edited by Yorgi; 11-06-2011 at 10:07 AM. Reason: fix link to picture
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