The water pump and/or the plastic side tanks on the radiator may leak causing a loss of coolant. The engine may overheat due to coolant loss. Continued coolant loss after external leaks have been repaired could indicate a blown head gasket.
Car Problem Reports
Buick Lucerne Coolant Leaks From Water Pump and Radiator
Buick Lucerne Problem
Engines Affected: 3.8L V6, 4.6L V8
Average Mileage: 109,933 mi (96,000 mi - 126,800 mi)