front, passenger side?

condenser as was suggested by jswartz or it could also be the serpentine belt just being cold as well. how long has it been since you changed it?

the grinding...do you have an asphalt/cement driveway? or do you live down a dirt road?

could be debris caught up on your rotor there up front. check the backing plate on the hub to see if its bent. might be letting crud get back behind the rotor.