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Old 08-05-2012, 08:21 PM   #160
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Join Date: Jun 2010
Location: CT
Posts: 2,115
My Ride: 2001 325i
When I did my cooling system refresh, I just drained all the coolant out that would come out, then refilled with fresh BMW coolant (mixed with distilled water). Some like to fill it up with water, then drain that ... seems like alot of work, to me.

The bolt is located on the passenger side of the engine towards the front, above the suspension. One of the DIYs has a picture of it.
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