Also, check the water pump pulley for play. If you feel any play, replace the pump. If the pump fails, besides risking overheating, the WP impeller usually breaks up and you risk clogging the cooling system with pieces of the impeller, which can lead to catastrophic engine failure after you replace the WP.
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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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