I know there is serpentine belt tensioner by the AC Compressor / PS Pump.
I know there is a supercharger belt tensioner near the Alternator.
I BELIEVE the serpentine belt idler pulley is BEHIND the supercharger tensioner.
There is what looks to be an idler pulley by the water pump as well??

The idler pulleys is what I am unsure of. The supercharger belt has no idler, only a tensioner, correct? The serpentine idler is BEHIND the supercharger tensioner, correct? But what is the idler looking pulley near the water pump??

When I look for parts, I am not finding two different idlers...only one type of idler and then both tensioners. So a bit confused on what to buy, as I need to change my belts and one of the idlers is starting to make noise, so I want to just replace all idlers and tensioners.

 

The idlers or tensioners use the same bearings, unless the wheels are worn, you can save yourself a small fortune by going to a bearing shop and just buy the new bearings!


Obviously, if the wheels/ tensioners show signs of wear/ damage, they have to be replaced.