This is a high pressure pulse caused by air inflow increasing the pressure in the cabin. Open diagonally opposed windows, and have the rear open more than the front, this will lower the air pressure and keep the cabin cooler, as well as stop the drumming.


 
					
					 
				
				
				
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					 Originally Posted by jx2mad
 Originally Posted by jx2mad
					
 
						
					 
						
					 ) windows up or down.
) windows up or down.
				
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