NewHilux.net

Had the car in for a service yesterday, informed them about the squeal, when the fan runs at low speed, but hasn't done it for a few weeks.
They have agreed to replace it. Didn't have one in stock, but one is on order to replace when it comes in.

Yes I had the same on a 2016 Prerunner. Felt like I developed tinnitus, super annoying. It would sound worse when I turned to the right. Got fan replaced under warranty, then after 15,000km it came back again. Glad to hear there is a permanent fix for this issue now.