Weird Rattling noise for a second at Cold Start

[Mullett757]

Hello all, ive been hearing this weird almost rattle sounding noise for a second whenever I start the 4runner up after its been sitting for a few hours. It only lasts a second or two at start up and then goes away. Anyone else have this noise at start up?

 

[Brownfaux]

The only noise I can think of like that may be the pulleys, but it's not really a rattle. Have to be more specific about where it's coming from.