Coolant Leak

Z4D · 10-12-2011, 09:49 PM

I have a small coolant leak in my 2004 3.0i that I can't find. I use 3 or 4 ounces of coolant a week. I can see a small amount of fluid on the lower engine bay sheet metal. I'm sure it's either a hose or the water pump. Anyone know how I can determine if its the water pump leaking ?

dharper · 10-13-2011, 06:06 AM

I would also check the coolant reservoir on the side of the radiator (it has the radiator cap on it). I replaced mine on my '03 earlier this year, and it solved the leaking issues. It is a simple repair once you get all of the trim out of the way as it literally snaps into the radiator at the bottom. While in there, replacing hoses is a good idea.

10-12-2011, 09:49 PM	#1
Z4D Registered 0 Rep 1 Posts Drives: Z4 3.0i Join Date: Jul 2011 Location: USA iTrader: (0)	Coolant Leak I have a small coolant leak in my 2004 3.0i that I can't find. I use 3 or 4 ounces of coolant a week. I can see a small amount of fluid on the lower engine bay sheet metal. I'm sure it's either a hose or the water pump. Anyone know how I can determine if its the water pump leaking ?
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10-13-2011, 06:06 AM	#2
dharper BMW CCA Member 29 Rep 90 Posts Drives: '19 BMW X3 30i-'11 BMW 128i Join Date: Oct 2009 Location: Music City area iTrader: (0) Garage List 2016 BMW 328i [0.00] 2011 BMW 128i Cabrio [0.00]	I would also check the coolant reservoir on the side of the radiator (it has the radiator cap on it). I replaced mine on my '03 earlier this year, and it solved the leaking issues. It is a simple repair once you get all of the trim out of the way as it literally snaps into the radiator at the bottom. While in there, replacing hoses is a good idea.
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