melting heater fan motor strip fuse

HELP! Plastic recepticle that 30A heater motor strip-fuse on inside left fender is melting on one end! Wire coming is gets very hot. Doesn't matter whether A/C is on or not; just fan.

Any ideas before a fire? Thanks!

opps! fuse melt mean your heater blower or the regulator get to be change lately ,it used more current running cause from the worn part at the motor, or from the speed regulator !