Hi,
The easiest way to determine which belt is making the noise is this. With the engine running, very carefully pour a small amount of water on one belt at a time. If the belt is slipping, the noise will change. Make sure to be careful around the fan and protect your eyes. Water will likely spray back at you. LOL
Does it get worse if you turn the steering? If it doesn't, it sounds like it is the alternator belt. And yes, that belt is adjusted from under the vehicle. I attached directions for doing it below. And yes, most tensioners are automatic tensioners. However, this one is mechanical. It requires you to loosen the center bolt on the pulley. Then from the bottom of the adjuster, slowly tighten that bolt for adjustment.
Before you bother adjusting it, with the engine off, check to see if it feels loose. The directions will show desired deflections. However, just make sure it is tight. If you place your hand on the belt between the cooling fan and alternator, it should move up and down about 3/4".
Check the tension on the PS belt as well. It is the same type of adjuster, but you may be able to get that one from the top.
Let me know.
Joe
See pics below.
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Wednesday, December 6th, 2023 AT 8:47 PM