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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 10-11-2011, 01:32 AM   #1
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Join Date: Jul 2011
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My Ride: 2001 BMW 330xi sedan
hey everyone have a coolant leak!!!!!!

It loses coolant frequently but does not over heat im thinking expansion tank but not sure whats another reasonable cause? Any help is appreciated
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Old 10-11-2011, 03:02 AM   #2
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Did you a puddle under the car?
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Old 10-11-2011, 09:39 AM   #3
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The expansion tank will leave quite a lot of coolant on the floor and not much in the car. I vote for a leaky hose.
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Old 10-11-2011, 10:33 AM   #4
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heres what mine looked like when I had a leaking radiator, my ET was fine:

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Old 10-11-2011, 11:17 AM   #5
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Have your coolant system pressure tested. I had a bad cap on the expansion tank. I noticed residue around the neck of the expansion tank. I replaced the tank as well.
2001 BMW 330xi
2009 Lexus IS-F
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Old 10-11-2011, 11:21 AM   #6
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Temp sensor O ring
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