So as you can see I am new to Mazda. I have been an avid Honda dude and I sold my 2003 Accord Coupe and bought me my 2006 MZ5 Touring Auto which I totally love, but there is this odd huming sound that seems to come from the front passenger engine bay area after shutting the engine. The sound goes on for about 10-seconds after turning off the engine everytime and ends with a sound of a valve or flap closing. Does anyone else or has anyone else heard this odd sound and is it something that should get looked at? What is this strange noise? None of my other cars have ever made this noise. Even my wife's 2004 Escape (Tribute) does not make this sound. Any help would be appreciate it, and no, it is not the regular humming sound that the electric power steering makes when engine is on. Thanks!