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E46 General discussion and technical help for 1999-2004 3 series cars.

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Unread 11-15-2007, 07:40 PM   #1
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Name: Jab42684
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Your Ride: 2003 325i
'03 325i Coolant Leak

Im losing a lot of coolant, over a course of 3 days I go through a half gallon and I can't see where it is coming from. I did a quick check of the hoses for dampness and nothing. The only residue I see is on the Overflow bottle, I let it sit for 3 days and still leaked out a half gallon. Im wondering if anyone can help me out or have any ideas, I want to say it's a hole in my radiator since it leaks that much when it isn't running but the thing is I dont see anything on the ground or in the pan on the bottom of the car.
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Unread 12-03-2007, 10:53 PM   #2

Name: TECH
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Make sure that the bleeder screw isn't leaking on the expansion tank. Check the expansion tank for a crack down either side, that is a very common problem. Look at the weep hole at the bottom of the water pump. Check all hoses, including heater hoses at the rear of the engine.
Make sure your oil isn't milky.
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