RepairPal Certified shops can diagnose and repair your 1999 Buick Park Avenue. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
The actuator is located behind the glove box. My 1995 Buick Park Avenue Ultra had this problem. It was fixed with a new actuator at a cost of $250 (price of part plus $100 lsbor)