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Old 11-25-2012, 01:29 AM   #5
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Join Date: Jul 2011
Location: Michigan
Posts: 150
My Ride: 46/325 B5/S4 39/M5
Hard to see what that is from the picture. It looks like a pressure pocket that exploded right though.

Remember though, plastic expands with heat, so you may not be able to see the crack or hole that easily if there is one in the ET. Either way, that looks to be the culprit.

Probably going to have to do a full flush after adding bottled water, including the heater core removal of coolant.
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