Belt type noise on startup and coolant

Good morning,
2005 SR5 183K
Short video attached of noise, let me know if the link doesn't work

https://photos.app.goo.gl/QvQo1AQbcrhkovxv5

Several heavy months of repairs. If I identify the issue prior to going to my mechanic and purchase parts it helps with the cost.

The vehicle's been making this noise on startup, it's been raining a lot and I'm in New England. It seemed worse after the rain. Yesterday I discovered that my coolant tank was empty.

- added coolant.
- put in some K-seal
- replaced the air filter

Overnight there has been no loss of coolant. Perhaps the noise is a little less?

The radiator was replaced fairly recently.

Appreciate all guidance! I leave Wednesday morning for a moderate road trip with the kids and I don't want to end up in a jam.

 

I have a very similar noise to your, only really happen on rainy / humid days for me maybe 5-10 seconds after startup then it disappears. I have replaced all idler pulleys and the tensioner pulley but the sound remains. Still troubleshooting but since my noise goes away after a few seconds, it is hard to track down.

 

Replace your serpentine belt. I just did this and it's amazing how much quieter the engine is now. No more annoying squeak. Over time, those belts become worn and stretched.

I flushed the coolant, replaced thermostat, and serpentine belt all at same time.

https://www.4runners.com/threads/dropped-nut-landed-inside-fan-clutch-pulley.37589/#post-570100

 

I have a brand new Continental Belt on, maybe 500 miles ago. Unless continental serpentine belts are trash then I have no issue buying a different one.