Quote:
Originally Posted by CRTZL1
This may sound a little crazy but make sure your car is at normal operating temperature and then pop the hood and carefully physically put your ear to the engine cover so it's touching it. That's how I first discovered mine. Even if it's a faint marbling noise it will get worse in time and you should replace it ASAP!.........
Good Luck! 
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I typically get in my car start it up and drive off. Today I'm off from work and started the car with the hood up and let it warm up. I always check my fluids regularly but the car is not running. Today I could hear a faint rattling noise at idle by just standing in front of the car, where the supercharger drive pulley is located. Going to the drivers side of the engine can hear a rattle as well, not so much on passenger side. This is why I never noticed it inside the car while driving it, with all of the moving parts the faint sound can be muffled by the sound of the engine, supercharger whine and the exhaust note. So, I called my dealership to inform them my car needs service based on the noise described in the letter I received from GM. I have an appointment scheduled this week. Thanks!