How hot should the blower resistor get?

Trying to track down a fuse melting issue with my blower - noticed on speed two when the ceramic resistor (pictured) is in use, it gets extremely hot - too hot to touch. Trying to work out if this is causing the fuse to melt as the resistance becomes too high?

If so, not sure why it's so hot. I've replaced the blower motor and ceramic resistor for a new (second hand) one and it's still getting extremely hot at speed two!

The green one came off the car and the black is the new one I've fitted. Both seem to get hot, so wondering what else is wrong with my wiring or if it is normal!

 

Check the MAIN blower Connector on the side of the Heater Box.  I have had 3 Cabbies, and they all had burned ground connectors on them. I just Spliced in a wire to ground on the motor side.

12v through 0.7 ohm resistor will draw 17 amps and generate 200w of heat. Obviously the motor resistance will come in to play and reduce that somewhat, but yes, it will get hot.