One problem related to engine belts and pulleys has been reported for the 1999 Volvo S80. The most recently reported issues are listed below.
I purchased this Volvo s 80 car as a second owner when it had 35,500 miles with 19,500 miles remaining on the 50,000 new car warrenty. The car had been serviced faithfully. At 57,00 miles the serpentine belt failed and the car quit. The car was towed to byers Volvo,columbus,OH. The serpentine belt caused the timing belt to get out of time which caused all the intake valves to be be bent. I was advised that the serpentine belt was scheduled to be replaced at 60,000 miles and that since the car was out of warranty, that I should contact Volvo of America. Again I was told that even though the belt was not due to be replaced until 60,000 miles , the car was still out of warranty and since I did not purchase it from the Volvo dealer, there was nothing they could do. I took the car to an independent garage and had the car repaired. I again contacted Volvo and received the same response. I feel that since the belt that caused the problem was not supposed to be replaced for another 30000 miles that there was an implied warrenty and Volvo should be held responsible.