Car Problem Reports

Pontiac Bonneville Engine Overheating May Cause Cylinder Head to Expand

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

Engine Affected: 4.6L V8


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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