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			any update of your issue? 
 
if still trying to find the sound, try to remove the engine cover access behind the seats and then find a plastic tube to use like a stethoscope while engine running.  Try to listen to your water pump, various pulleys, AC compressor and alternator. 
I eliminated several sounds from water pump, 2 pulleys and engine mount and now last one need to fix is my compressor but no time yet to do it.  Currently I have around 107k on ODO.
		 
		
		
		
			
		
		
		
		
		
		
		
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