I am tryin to replace the cerpitine belt on my 2003 350z and need a lil help to where the tensioner screws are to losen the belts?..in the process now so please help...thanks

 

the tensioner has a nut that in the center of the pulley loosen that nut then below the tensioner there will be a long bolt that holds the tensioner and is bolted to the motor as you turn the long bolt it will move the tensioner and make the belt loose or tight! make sure to tighten the nut in the center of the pulley when your done!

 

Both of them are accessed from the bottom.

 

The others have covered where the tensioners are.

I had to point out the horrific spelling error.

 

https://my350z.com/forum/engine-drivetrain-and-forced-induction-diy/333152-diy-replacing-your-belts-very-easy.html