I started my car this afternoon and there was a loud squek from my power steering. Once i pull out of my driveway it stops and doesnt come back for a few hours and then it wont stop. I checked the belts the power steering fluid and they are a fine power sterring fluid is full and the belt is not skipping on the pulley. Dont what else to check, any help would be nice. I have a 2002 Wrx.