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Old 05-28-2008, 02:19 PM   #3
Okie Guy
Montana Master
 
Join Date: Jul 2006
Location: Olahoma City
Posts: 1,219
M.O.C. #6054
Both of my units have made the sound when using electric. I believe it is a normal sound of the cold and hot meeting each other that causes the sound. I have also been known to be wrong.
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