[tommymamn]

Hello all,

I am having trouble identifying where this noise is originating from. I'm hoping someone else has had a similar problem and knows what is causing it. It could be the idler pulley, tensioner pulley, water pump, power steering pump, a/c compressor, or alternator. I shot a video so you could hear. Thanks in advance for any help given!

Tom

2011 Sienna Unidentified Noise

 

[ericreyn]

You could take the tension off the belt and feel the play in each pully.
It could give you an idea of which one it might be. I dont have a 2011 but the 2009 has 3 idler pullys and all the others you mentioned.

 

[shoult]

The waterpump looks like it's running true and that's not the noise I've heard failing Sienna waterpumps make. It sounds more like a failing bearing. So removing the belt and feeling for which pulley, idler, tensioner isn't rotating well is the best route. And while I say the waterpump looks okay, as long as the belt is off make sure to check it as well.