Coolant Leaks From Water Pump and Radiator on Pontiac Bonneville

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 96,000 (96,000–96,000)
Engine affected: 4.6L V8
2 model years affected: 2004, 2005
3 people reported this problem
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