@pamp Let's start with checking to see if your fans work.
Try using M106 to adjust the fan speeds and see if they match what you expect.
I ran Simplify3D and see it uses M106 S0 and M106 S255 to control the part cooling fan.
M106 S0 ; Stop the cooling fan M106 S255 ; Run the cooling fan full-speedDoes this produce the expected results when you type them in?