- Head Gasket Failure 14 complaints at an average of 96,644 miles in the 2001 Pontiac Montana.
- Intake Manifold Gasket Failure 43 complaints at an average of 93,045 miles in the 1999 Pontiac Montana.
- Coolant Leaking Into Engine Oil 9 complaints at an average of 89,097 miles in the 2003 Pontiac Montana.
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