2011 Avalon high pitched whistle

blower motor might be going out. worn out bearings.

indicates wind turbulence noise
possible around rear view mirrors , weather shields , door edge , bonnet edge , headlights
trial and error is to place tape over adjoining edges to see where a placed tape stops the noise

Ive seen this on trucks with foldaway mirrors. The wind whistles through where the mirror mounts to the base. Try putting a piece of tape over it and driving to see if it stops.

Take it to the dealer...they will fix it...for free - under warranty!
GL,
Td

I am having this same issue. I have changed my brakes and now I was going to change the front wheel bearing, but unsure to dump a lot of money out on an unsure fix.
Let me know if anyone has a fix?

I know this original question was written quite a few months back but I was wondering if you ever found out what the high pitch sound was. I just purchased a used 2005 Honda Odyssey and it is doing the exact same thing. Any advice?

this sounds odd but mine did this when i replaced the wipers. it seems the design of the wiper frame was making a whistle at higher speeds. the freestar wipers are exposed on the window cowl and not hidden so they endure the winds at high speed. it is worth a shot.

TAKE IT TO THE DEALER ITS UNDER WARRANTY

hi ,,two things 1- water pump. but most likely check your pulleys they will make that high pitch noise one of them fixing to go bad and what will happen the belt will jam and jump lose and will lose all power ,,cause you have one belt for alt and the water pump mostly its the pulley right under the alt ,,hope this will help ....Joe

I have the same problem like yours but what i did is to replace the alternator and now its so quite no more high pitched sound. You may used belt stress fluid but its only last for few seconds then sound comes again. I replaced it with refurbish part alternator.My sienna 2005.