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Old 09-07-2017, 05:12 PM   #4
68gmsee
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Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
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Re: White build up in a brand new aluminum water neck

Aluminum reacts with certain chemicals in the coolant. I've had bad luck with aluminum t-stat housings corroding before and usually wind up replacing them every couple of years or so.
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