The idler pulley for the serpentine belt can fail causing noise from the belt area. Our technicians report the pulley has been known to fail completely which can cause the belt to break or be thrown off.Google+
Car Problem Reports
Saab 9-3 Noise from Idler Pulley Failure
Saab 9-3 Problem
Engines Affected: 2.0L 4 Cylinder Turbo, 2.3L 4 Cylinder Turbo
Average Mileage: 117,705 mi (75,000 mi - 164,000 mi)
Visitor, 1999 Saab 9-3, 2.0L 4 Cylinder Turbo, 126,010 mi
Before my idler pulley failed, I would hear a high pitched whine upon start up for 5 minutes or so and then at high rpm. Pulley finally failed, broke in half and caused the car to run hot.
Visitor, 2000 Saab 9-3, 76,500 mi
pulley failed causing belt to rip
Alternater bracket with pulley, broke. Best didn't break but it needs replacing. We have ordered a new bracket and pully.
Visitor, 1999 Saab 9-3, 2.0L 4 Cylinder Turbo, 75,000 mi
noise from pulley replaced pulley
Visitor, 2002 Saab 9-3, 2.0L 4 Cylinder Turbo, 105,000 mi
Same problem hearing a high pitch whining when i first start, then it goes away after10 seconds i believe its time to change the serpentine pulley, honestly i bought this car with 60k on it and its been in the shop twice a year for something.What i steming pile but my wife had to have it. cant sell it,its like a mother in law.