You didn't say if you followed the previous advice of having the vehicle elevated for an extended period of time while bleeding the cooling system.
You've spent untold amounts of $ on your local mechanic with no results. At this point why not visit a qualified Nissan mechanic?
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2001 Nissan Sentra GXE
2006 Nissan Murano SL
2006 Nissan Pathfinder LE
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