[Juge88]

It feels like the dash and floor is shaking and makes a really loud buzzing sound on all settings Getting louder the higher the setting

 

[paart]

It's most likely the blower itself. It may be evident once you remove the motor/squirrel cage assembly. Perhaps something made it through the air intake and is jammed into or bent the blower, or the the blower has come loose from the motor.