Clutch fan options on my 340?

Hayden 2947

So how much will the thermal unit be engaged by at normal engine temps? My question is, is the thermal clutch better at high rpm more so than the fixed? Or will it be completely engaged at normal operating temp anyway?

I guess in theory the clutch fan will deliver only as much air as the engine needs correct?

I watched the engine masters again to refresh my memory but they were running the thermal unit inside and even stated that is was still cold and showed spinning the fan while the engine was off, so is that a bad example? It will rob less hp when engine is cold but what happens at operating temp?