[jojojijijojo]

Hi guys,
The bottom coolant hose that connects to the expansion tank has swollen o-ring and now it leaks, I'm trying to find the hose part number to get the seal from, anyone knows it? Marked in red.

[mainbearing]

That may be #23, 4-way hose sold as an assembly. For 2007-2011 328i Sedan E90 the part number listed is 17127548224. Only $142.58. Why can't BMW just mold bibs and connect rubber hoses directly?

https://www.rmeuropean.com/Products/...MFG9-V271.aspx

[fravel]

Originally Posted by mainbearing

That may be #23, 4-way hose sold as an assembly. For 2007-2011 328i Sedan E90 the part number listed is 17127548224. Only $142.58. Why can't BMW just mold bibs and connect rubber hoses directly?

https://www.rmeuropean.com/Products/...MFG9-V271.aspx

This is correct. That whole item (#23) is a single assembly.

[jojojijijojo]

Thanks guys, the reason I needed that part is because the o-ring went bad, anyone can help me identify the size of that o-ring that goes into the bottom of the expansion tank?

[E92_William]

Originally Posted by jojojijijojo

Thanks guys, the reason I needed that part is because the o-ring went bad, anyone can help me identify the size of that o-ring that goes into the bottom of the expansion tank?

O-ring is in the hose plastic fitting itself. Some ebay sellers have o ring kits for all sizes to use in the cooling system for these cars, maybe one would fit for your hose.

[E92_William]

Originally Posted by mainbearing

That may be #23, 4-way hose sold as an assembly. For 2007-2011 328i Sedan E90 the part number listed is 17127548224. Only $142.58. Why can't BMW just mold bibs and connect rubber hoses directly?

https://www.rmeuropean.com/Products/...MFG9-V271.aspx

Well they do, the plastic fitting is a part in itself that has a place for the hose to grip to and be removed from. Just need to cut off the metal clamp and you can swap the hose or fitting. Had to do that when doing my oil to water cooler conversion.