While my mechanic was checking tie rods on the car they noticed seepage from the intake manifold. Luckily it was caught very early-no mixing of oil and coolant. Intake manifold, elbow and assembly replaced; original GM gasket design and materials were inferior however the gasket redesign takes care of the issue. Plenum was also weak; something he said he commonly sees on my series of 3.8L GM engines because of faulty design and materials. $943 job when all was said and done.

- Milwaukee, WI, USA

Vehicle intake manifold gasket failure. Cheap and defective plastic manifold gasket broken causing antifreeze to leak into engine and mix with oil of vehicle. Caught before major damage occurred like engine failure.

- Melvindale, MI, USA

My 2001 Grand Prix was having a cooling and engine malfunction..cause the engine to overheat causing a potential fire hazard..my Grand Prix is not supercharged however, the same problem described with the supercharged happened to this vehicle...

- Sacramento, CA, USA

The intake manifold gasket is causing a huge amount of consumers to replace parts in vehicles. The gasket leaks causing a mixture of antifreeze and oil causing engine damage. Even after the repair is done, because of design, it will just fail again. I just had it replaced 1 1/2 years ago, now I have to do it again.

- Las Vegas , NV, USA

The contact owns a 2001 Pontiac Grand Prix. On March 25, 2008, the dealer replaced the leaking water pump, flushed the system and added anti freeze. Anti freeze was leaking on the drivers side of the vehicle on March 25, 2008 and on March 26, 2008 anti freeze continued to leak into the vehicle on the drivers side of the and in the garage. The failure and current mileage were not available. The service manager stated that the fluid might be over residue. The dealer will inspect the vehicle today. The purchase date was unavailable.

- Indianapolis, IN, USA

Low coolant light came on. Found coolant to be low. Added the GM coolant. 2 weeks later same thing happened. Took vehicle in for repair. Intake manifold leak as reported by hundreds of other consumers with repair bill of $700. Vehicle was maintained exactly as prescribed by mfg.

- Greenwood, IN, USA

Water jacket tube failure on 2001 Pontiac Grand Prix.

- Perry, OK, USA

Coolant fluid leaking onto engine block. I have read about the gasket problem with this car and I'm pretty sure that's the problem. I have not taken it in to the dealership because I don't want to pay $700 for something that is obviously a manufacturing defect.

- La Mesa, CA, USA

Leaking coolant. Failure of lower intake gasket for cooling system. Dirty dex-cool coolant with unusual consistency. Repair included replacing lower intake gasket, flushing cooling system, and replace thermostat. Total repair cost was $700. This has become a common problem reported with this GM 3.1 L V6 engine. Problem could have led to failure of engine on highway.

- Cary, NC, USA

Low coolant light remained on for long periods. Indicating that the problem was a leaking front head gasket. Estimated repair cost was $700.

- Carmel, IN, USA

Took in 2001 Pontiac Grand Prix for routine oil change. Technician discovered sludge in radiator and coolant reservoir tank. Indicated the problem was a leaking intake gasket. Repair costs $700-800.

- Bloomington, IN, USA

Cooling system * took car in because of check engine light vehicle running rough. Diagnostics indicated fuel injector problem. Further diagnosis indicated that the lower intake leaking / lower intake gasket leaking. The service writer recommended replacement. I didn't have time to get second opinion or do more research. Just discovered that this was in a bulletin in July, 2003. I am just out of warranty with less than 30,000 miles on vehicle (2001 Pontiac Grand Prix, purchased new in January 2001).

- Avondale, AZ, USA

Pontiac 2001 Grand Prix has 49,000 miles and radiator is filled with sludge and losing coolant. Dealer examination reveals bad manifold intake valve with coolant and oil mixing in reservoir and engine compartment. Researched on internet and found hundreds of similar complaints for various GM makes over last several years. Some incidents reported manifold intake exploded and resulted in fire. This needs to be addressed by GM. Estimated cost of repairs $700 -$1,000. Dealers are aware of problem and try to hide that fact, basic consumer fraud,

- Westerville, OH, USA

Low coolant lamp remains on for long periods. Water needs to be added to radiator before driving because the coolant will not siphon back into the radiator from the plastic recovery tank.

- Essex, MD, USA