General wisdom is to replace the water pump preemptively every 4 years or 50k miles or so. If the pump goes, the plastic vanes can crack off and clog the coolant passages leading to localized overheating and a cracked head.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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