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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 10-06-2012, 10:50 AM
Vele Vele is offline
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Location: Ottawa
Join Date: Oct 2012
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Mein Auto: 2001 325i
Loosing coolant.

I own a 2001 325i. It looses antifreeze frequently, basically adding a bit more every 2-3 days. I know there is a blue bleed screw under the car driver side close to radiator. Can this be a gasket issue or something else. Like fixing things my self just need tips. The leak seems to be close to that bleed screw...
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Old 10-06-2012, 10:37 PM
GoForthFast GoForthFast is offline
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Location: New York
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Mein Auto: '04 330Ci 6-speed
Very probably your expansion tank.
Plan to replace it and maybe do a cooling system overhaul if due.
Leak there can be hard to see.
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Old 10-08-2012, 09:27 AM
ventsyv ventsyv is offline
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Location: Baltimore, MD, USA
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Mein Auto: 03 BMW 330ci
I would start by checking the upper radiator hoses for cracks. Then look for signs of coolant - when the coolant evaporates, it leaves a white residue.
The expansion tank is usually a prime suspect.

I posted a similar thread a couple of days ago, in my case it turned out it was the expansion tank. Very sneaky little leak. Search for the thread if you want.
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