The water pump may fail resulting in engine overheating and possible timing belt damage. Overheating and/or timing belt failure can result in very expensive engine repairs. As a precaution, it is recommended to inspect the timing belt and water pump at regular intervals.Google+
Car Problem Reports
Audi TT Quattro Inspection of Water Pump and Timing Belt
Audi TT Quattro Problem
Engine Affected: 1.8L 4 Cylinder Turbo
Visitor, 2004 Audi TT Quattro, 1.8L 4 Cylinder Turbo, 66,000 mi
teeth on timing belt broke off ,all valves bent and pistons marked up!!!!