2001 Mitsubishi Montero Noise coming from Serpentine belt

Hi
Assuming you don't have a stethascope cut a 3ft lenght of 1/4 to 5/16 hose. Being very careful one end in ear the other move around runnig pullies see if you can ID noise.
Let me know
Thanks for donate

The noise does not seem to be coming form the alternator, but it was so noisy on the pulley above and below the alternator. The pulley below was wiggling a bit, and when the motor is off it is the only pulley that has any play in it. I don't know what that pulley is for though. The motor sounds like a diesel, but again, no performance issues. Looking at the motor from the front of the car, on the left you have a pulley up top, I think it is the water pump?, then to the left and lower is the alternator, and then almost level but to the right is another pulley. This is the one that is moving a little bit and the one I think is making the noise. Is it ok to drive it like this? Do you have any ideas? Thanks for your response and help.

That is the tensioner pully and if movement then bearing faulty. Would not drive too much before repair. You do have three belts right?

No, it is just the one belt.

How easy is it ot repair this pulley by myself? It doesn't look to complicated, should I give it a go? Thanks for your help.

Not hard at all but you sure there is only one belt. Is this a 3.5L V6?

Yes, 3.5v6. One belt.

I have no info for one belt all my diagrams show three seperate belts to run all the acessories.
But pully is still easily replaced.

replaced the tensioner pulley last night and al symptoms are gone. That was our culprit. It was a fairly easy job and I got it done in about 30 minutes. The old pulley was practically seized up. Thanks for all of your help.

Glad to hear You did good diagnostics.