Car Problem Reports

Pontiac Bonneville Coolant Leaks From Water Pump and Radiator

Pontiac Bonneville Problem
3 Reports
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Model Years Affected: 2004, 2005

Engine Affected: 4.6L V8


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.

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