The gauge is showing one or two hash marks high, occassionally goes higher and blows cold air from heater. After getting that high, goes back to normal and stays there. Usually does this when the car has sat for 30 minutes or more. The cooling fans are running during this time.
RepairPal Certified shops can diagnose and repair your 2006 Buick Lucerne. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.