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 2500 Leaking Water Pump May Cause Coolant Loss and Overheating
Chevrolet Express 2500 Problem
Engines Affected: 4.8L V8, 5.0L V8, V8
Looks to be leaking around water pump. Bought a new seal kit and am looking to see how hard this is going to be to replace.
Visitor, 2006 Chevrolet Express 2500, 4.8L V8, 130,000 mi
Blown head gasket or cracked head