Belt tensioner

Do you mean you need to tighten the power steering and compressor belt? The water pump is driven off the timing belt so I assume this is the belt you are talking about.

Please see the diagrams below. You will see where the adjustment screw is there that will tighten the belt.

Please review this material and let me know what questions you have.

Here is a guide that will help others with this as well if they need it:

https://www.2carpros.com/articles/how-a-serpentine-belt-tensioner-works

Thanks