The contact owns a 2004 GMC Sierra 1500. The contact stated that the valve head was cracked and the anti-freeze was depleted; however, there were no visible leakage. There were no warning indicators illuminated. The vehicle was taken to an independent mechanic who stated that the engine needed to be replaced. The local dealer and manufacturer were not contacted. The vehicle was not diagnosed or repaired. The failure mileage was 131,000.

- Valencia, CA, USA

The contact owns a 2004 GMC Sierra 1500. The contact stated the head gasket leaks radiator fluid into the motor. The contact took the vehicle to a certified mechanic that diagnosed that the engine head needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 130,000. The VIN was not available.

- Lexington, NC, USA

The contact owns a 2004 GMC Sierra 1500. While driving approximately 65 mph, the vehicle suddenly stalled. During the failure, the temperature gauge reading was high and steam appeared from under the hood. The dealer stated that the engine cylinder head was cracked. The vehicle was not repaired and the manufacturer was not notified. The failure mileage was 76,400.

- West Newton, PA, USA

Cracked cylinder heads, also known as castech head casting #706 these heads crack on the engine cause antifreeze to mix with the oil and destroy the engine, I have contacted GM and they will do nothing for me, even though there has been lawsuits and its a very well known problem with the vortec 4.8 and 5.3L GM engine.

- Oxford, ME, USA

Exhaust manifold bolts broke off causing the drivers side heat shield to fall and jam under the steering linkage. This caused me to almost drive off the road. I had to force the steering wheel to get the vehicle to turn.

- Rockford, IL, USA