One problem related to engine belts and pulleys has been reported for the 2001 Cadillac Deville. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Cadillac Deville based on all problems reported for the 2001 Deville.
Adding oil to car from a quart (once a month)to now weekly. Also passenger seatbelt trouble buckling,antifreeze leak when car is parked.