is the Thermal management button (top rightmost touch button) working?
Please make sure you select high cooling efficiency!
Maximum CPU Temperature should always be below 90 C even in hot ambient.
and have a look at Y470 review...
they measured temp of laptop body to be max 20 C higher than room temperature!
I went to the store and found out that my fan was not working which caused overheating after 30 mins !!! so I demanded a replacemnet and now I have a new Z470 I hope it will not be the same