Does the fan blow in the high speed on ALL switch settings?
Which fuse did you remove?
When you put it back in does it immeadiately start the fan again?
Do you have a meter for checking voltages?
Are you absolutely certain it is blowing at the very highest setting and not one of the lower settings. It will make a difference how we diagnose this.
If you are certain, then install the fuse and remove the HVAC BLO relay in the instrument panel fuse block.