a bad switch.. it probably works on very very low... wiggle it and see if you get a momentary gust of air.. if so .. nothing 80 dollars wont fix.
blocked heater or evaporator core. Fan may have sucked up something and blown it against. Blend door or one of the others in an automatic temp control may be causing the air to not flow properly.
Could be hi-speed fan relay or secondary winding in blower motor
It has a bad "Blower Motor Resistor" The fan switch itself is fine.
A glass blower is a person that blows glass.
Blows hot or cold air (as selected) through the ductwork behind the dash.
blower motor resistor
it's a problem with the blower motor resistor
Replace the blower motor also.
there are resistors located by blower motor. could be open. they control blower speed.
under the hood.. by the windshield wipers.. it blows in .. doesn't suck through.
It will be located somewhere in the path of the air that the blower motor blows.
Somewhere in the path of the air that the rear blower motor blows
As for why it blows only on the high speed you most likely will have a bad blower resister and for the noise, it could be a bad blower motor, bad blower wheel or trash that is stuck in the blower wheel or housing.......