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Unread 10-15-2002, 11:24 AM   #8
bigben2k
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Join Date: May 2002
Location: Texas, U.S.A.
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Maybe there's a funnel forming at the pump inlet, causing it to suck air.

The rig is a closed loop if, and only if, the coolant can flow in either direction, and a return of coolant is forced. If any air can get in, then it's an open loop.
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