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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 03-10-2013, 04:29 AM   #1
Registered User
Join Date: May 2012
Location: Melbourne
Posts: 80
My Ride: 325ci
Loss of coolant

Hey guys,

my car lost all its coolant, i have found the part causing the problem, seems to just be a pipe. As you can see in the video below there is a hole which is spitting out coolant:

View My Video

Does anyone know what the part number for that is? And is it easy to replace? I have never really played around in the engine before...

Thanks for the help in advance.
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Old 03-10-2013, 09:34 PM   #2
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Join Date: Feb 2008
Location: Arkansas
Posts: 407
My Ride: E46, E53, E90
Its Kind of hard to see from the video, but I think you are missing the blue screw cover on that. I believe that is the expansion tank overflow port that is used to "burp" the system when you do a flush. Look at the top screw that is used to let the system flow through the lower drain plug (video). Have you checked realoem.com for the PN?

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Old 03-17-2013, 09:07 PM   #3
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Join Date: Aug 2010
Location: Rancho Palos Verdes
Posts: 160
My Ride: 1999 e46 323i
It is taken from the top of the radiator, not the bottom. It look to me like either

The expansion tank is cracked, or
The radiator is cracked.

There is no pipe there. Both can be replaced.
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