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Old 11-13-2012, 03:36 PM   #7
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Join Date: Aug 2006
Location: NJ
Posts: 23,711
My Ride: '99 328i 300K miles
You can clean up the residue you see, fill up to proper level, remove underskirt, and find out where your leak is. Jfoj might be right that it's the 0-ring...which, if leaking, is worth the 'expensive' IAT o-ring...but it could be leaking elsewhere. Clean things up, run car, and find source of leak.

Or, as you said, just replace everything. If you don't want to replace everything, you need to diagnose what's leaking...simple as that.

Check the entire system...I like using my 100 lumen flashlight for looking at won't believe what a difference having proper light makes to clear diagnosis.

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