M3s are notorious for water pump failures. They should be changed at least every 60k. Or do what i did. Call turner motorsports or UUC and get there woter pump with the metal impeler. It was actually inevatable that it happened to your car. im surprised it didnt do it sooner.

__________________
Dinan M3

2006 X5 4.4i Sport Current Vehicle
2006 CLS 55 AMG Current Vehicle
2010 FORD F-450 King Ranch Current Vehicle
2012 GL 550 Current Vehicle

1999 M3 Dinan S3 SOLD
2001 M3 Dinan S2 SOLD
2002 M5 SOLD
2004 X5 4.4i sport SOLD
2007 335 XI Lease ended
2009 E92 M3 SOLD