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timboe53

07-26-2021 10:16 PM

Coolant leak

1 Attachment(s)

I have a coolant leak I can't seem to get to the bottom of. It is right at the bottom, below the oil cooler. I replaced the oil cooler o-rings but it's not that - it look to be coming from just above the torx bolt in this picture?

80stech

07-26-2021 10:33 PM

That could be the radiator tank seal leaking.

timboe53

07-26-2021 11:13 PM

So would would be the best way to confirm that?

80stech

07-26-2021 11:33 PM

Wash and dry it off then watch closely. It will probably be most likely to leak as the engine is cooling off. You could try to pull off the rad cap with the engine cold and watch it. A pressure tester and dye might help as well if you still can't find it for sure.

X5only

07-27-2021 01:09 AM

1 Attachment(s)

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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