What is wrong with my Tundra?

I have a 2011 Tundra that I just bought. I found it making this really loud noise somewhere near the fan. This sometimes goes away when you put the truck into drive, but I have seen it do this while in drive. This is not a constant thing. It comes and goes without much warning.

The link below is to a video of the truck while its making the noise.

I have a 2011 Toyota Tundra Limited with the 5.7 and about 163k miles on it.

https://youtube.com/shorts/FI0Sjjz4AzU?feature=shared

 

Its a bearing. Pull the belt & spin everthing looking for loose or crunchy pulleys.

 

You think the bearing would come & go like that? I do think you’re probably right. I was thinking an idle pulley or something. I will check that out, thanks.