Thanks for the heads up. With the belt off I can spin the fan ( engine cold ) and it spins several revolutions and I can hear bearing noise.
With the belt on the clutch I can spin the fan and it has resistance and the noise goes away .No movement , and new fan bracket installed 15k miles ago.
I'm putting up the white flag and surrending to Toyota today . Although they will surely give me that look like nothing's wrong and I'm crazy. I found a video from
@Pyrenees which had the exact same noise but a fix wasn't ever found/posted.
Looking at your video, with belt off. Your fan clutch did not spin. It was fan bracket (bearing) spinning. Sound was not really clear as to what I was hearing. As we do get a little wind sound from fan pushing air. But if you can hear, that is a clue of bad fan bracket bearing. All bearings, especial one like the fan bracket, which is encased. Should be near silent when spun, and will not get picked up with a camera mic. Any sound heard, should be smooth and continuous (not oscillate). Like the new idler bearing you just put in. If you spun it after install belt off, it was silent right. A bad fan bracket bearing, may have kind of a "hard" sound (if that make sense) when free spinning.
A fan bracket bearing. Once bad long enough, we typically see pulley wobbly. Earlier stage as going bad, may squeal. I put my stethoscope on fan bracket itself, with belt on and then belt off. The tricky part or using stethoscope is sound travels through the belt. So use it belt on then belt off, can be helpful in isolating.
When I do a coolant service. I like to start by washing radiator fins. This get belt and pulleys very wet before I'm done. If a tensioner or idler bearing is bad, its seal is also. The water will make it sing as it get past the seal. I'll then use stethoscope to help isolate, once belt off, If I spin and not easy to make the call.
Fan bracket, vane pump and alternator can be more changeling, belt on or off. For those I put stethoscope on body/housing. Fan bracket is easier to hear, than alternator or Vane pump. Vane pump will usual leak, if has a bad bearing. Alternator can be the most difficult. I've found, alternator's on the way out, tend to be milder short duration squeal and to be intermittent. But in most all cases, a bad bearing will chip or give oscillating or a "hard" sound.
After replacing bad bearings, and doing rest of coolant service. I wash radiator fins again, as they take repeated washing to get fins clean. If now I hear squealing again, after I stop washing and engine idles for a few minutes (drying belt). I can wet belt and sing/squeal stops. It's the belt.
