A coolant leak may develop from the water pump. This can result in an engine overheating condition. A leaking water pump will require replacement.Google+
Car Problem Reports
Chevrolet Express 3500 Leaking Water Pump May Cause Coolant Loss and Overheating
Chevrolet Express 3500 Problem
Engines Affected: 5.7L V8, 6.0L V8
Average Mileage: 105,666 mi (38,000 mi - 213,000 mi)
Visitor, 2006 Chevrolet Express 3500, 6.0L V8, 38,000 mi
Complete failure of water pump at 38,000 miles. Just out of warranty. Replaced with new water pump.