It's likely the mounting plate - part #15 (there're two O-rings there that tend to leak. I had a leak there and replaced those O-rings (#17) when I flashed the coolant.
https://www.realoem.com/bmw/enUS/sho...diagId=17_0291
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.
Last edited by X5only; 07-27-2021 at 01:45 AM.
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