More than likely a rear strut or rear shock
~Angelic Beauty~
If the noise is a squeaking sound, it could be coming from the bearings in the blower fan. It could also be coming from a worn bushing or bearing in the blower motor.
If its slipping you will smell it. If it shutters you probably have grease spots on your fly wheel. Grinding noise may mean you need a new pilot bearing(throughout bearing).
wheel bearing?
A 2003 Lexus with an intermittent grinding noise might mean that there is a tire rim rubbing on the brake disk. It could also mean that a tire is rubbing on a fender wall when turning.
The break pad.
Ford Dealer can help you. And tell you if there is anything wrong with your 2003 F150.
Brake linings worn out or wheel bearing is bad
BRAAAAAAKKKKKKKKKKKKKKKKESSSSSSSSSSSSSSSSSSSSSSSSSSSSSS!!!!!!!
many reasons, steering pump, cv joints may be going out, or you could be grinding some plastic that goes around the wheel
Your front breaking pads are needed to be repalced, you might have to replace rotors.
Take it to a garage!
Not enough info. What kind of noise? Coming from where? Under what situation(s) does it occur?