Intake Manifold Gasket May Leak Coolant or Engine Oil on Pontiac Montana

The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Our technicians tell us that operating the engine  with a coolant/oil mix can result in internal engine damage. Replacing the intake manifold gasket should correct these leaks.

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Average mileage: 134,000 (60,000–298,000)
Engines affected: 3.4L V6, 3.5L V6
7 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005
33 people reported this problem
14 people shared problem details
2005 Pontiac Montana- 3.5L V6111,000
Coolant is leaking from the lower intake gasket onto the ground.
2003 Pontiac Montana- 3.4L V662,000
Smell of hot antifreeze, coolant disapearing
Started leaking oil two weeks after a oil change. Took it to one shop they said nothing was wrong. Took it to another and for sure three hours later they found out it was an intake manifold. Are these things common
1999 Pontiac Montana- 3.4L V6
I have water mixing with the oil but no leaking on the ground
2002 Pontiac Montana- 3.4L V675,000
Intake manifold gasket leaking coolant, had to replace gasket twice!!!!!
Coolant leak at intake manifold gasket. Replaced at GM dealer with new design gasket.
2002 Pontiac Montana- 3.4L V6140,000
intake leaking coolant
2001 Pontiac Montana298,000
MY MONTANA IS STILL LEAKING AND MIXING WITH THE OIL ENGINE. IT'S OVER HEATING AND STOP AT ALL TIMES. AFTER 3KMs,IT'S WARM UP VERY HIGH. I LIVE IN OTTAWA, CANA AND I NEED A GARAGE TO FIX IT FOR. IS IT A RECALL FROM THE MANUFACTURE?
2000 Pontiac Montana143,000
But this is not the first time we've had to replace the intake manifold gasket.
intake manifold gasget leaking
2004 Pontiac Montana130,000
My oil stick showed very high level of oil in it. The color is off so it has to be leaking anti-freeze into the engine.
2003 Pontiac Montana- 3.4L V6
Had antifreeze and oil missed together had a technician fix it
leaking oil/transmission fluid. replace intake gasket $950.00
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