Engine Overheating Due to Leaking Headgasket on Pontiac Bonneville

Overheating of the engine may cause the cylinder head to expand, severely straining the head bolts and damaging the threads in the engine block. This commonly results in a blown head gasket. Our technicians tell us the engine block threads must be repaired before the cylinder head is reinstalled.

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Average mileage: (–)
Engine affected: 4.6L V8
2 model years affected: 2004, 2005
2 people reported this problem
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