I never really noticed this noise until just recently. Its like a mechanical/electronic hum when I press down on the clutch as the car is still warming up. After the car has warmed up, it disappears. I have a 2005 G35 6MT sedan. Is this something I should be worried about?

Thanks in advance...

 

i got an 06 coupe and i hear a humming sound to. especially when i am parked next to a wall (it echos) i think it is the radiator fan motor because when i turn the car off i can sorta hear it wind down. i could be wrong..

 

Oh the thing I forgot to mention is that it only happens when i press on the clutch pedal.