Help finding coolant hose name and part #

[Cannellizer]

Hi,

I've got a question about really just the vernacular of a hose. So Yesterday a ton of coolant spilled out of the bottom of my car, and today I was looking around to see if I could see any issues. I decided I needed to replace a hose. See pic below. Basically there are 2 hoses that come out of the bottom of the expansion tank, and I'm just wondering what those hoses are called. I had o'reillys order in the longer of the two and I'm planning to pick up tomorrow. But just wondering if someone knew a part # and information on it.

PS - I don't know much about cars, so if you respond, please communicate as if you were speaking with a 5-year old. Thank you

IMG_20170218_155725.jpg

[MN2K740i]

Where does that second hose go? On my 98 528i the expansion tank is blocked off, just have the one hose.....

- - - Updated - - -

Auxiliary water pump hoses....

Screenshot_2017-02-18-19-43-47.png

[Ed CT]

See here. I guessed at your build year. This site has all the parts on your car.

http://www.realoem.com/bmw/enUS/show...diagId=11_2638

[Cannellizer]

Thank you for the replies folks.

Ed CT, perfect link, Thank you so much!

[Ed CT]

You're quite welcome. Save the url - it comes in handy when ordering parts using the BMW part number.

[Mike WW]

Be careful. I think the expansion tank is more likely the problem than the hose. The plastic seems to degrade faster than the rubber. Many consider it a maintenance item just like radiators, although they do last longer than that.

[crazy4trains]

^^^ What he said. Those hoses usually last much longer than the expansion tank. Most people recommend changing the entire cooling system every 80k-100k miles.