There are different engine types in Volkswagen Beetles, and whether you need to replace the water pump or the head when the timing belt goes depends on the engine.
For the 1.8T and 2.0 engines, the timing belt drives the water pump. When the timing belt goes, the water pump will stop working, so it needs to be replaced.
For the 1.9L TDI engines, the timing belt does not drive the water pump, so the water pump will continue to work even if the timing belt goes. However, the head may still be damaged if the timing belt goes, so it is important to have it inspected by a qualified mechanic.
