Ford Escape - replace degas bottle to thermostat housing hose assembly?

Really? Replace all four blahblablah. What TF are you on? Do not, under any circumstances, pay attention to the trolls, Ruskybots or Teslastans.

If it sounds too stupid and expensive, it is.
You're actually correct on this.....except for the stupid insults that aren't necessary.

I researched it a bit and Ford does not use the viscous coupling for AWD, they use a transfer case. It's different than the 4x4 transfer case but a transfer case nonetheless.

I can say from FIRST HAND EXPERIENCE that the AWD system in the Dodge Durango does use a viscous coupling and will experience trouble if the tires are not very closely matched. I've seen it happen.

So forgive me for getting something wrong.