My water pump blew out on my M3 on Christmas Day of all times. The worst day to have a total breakdown.

Radiator, water pump, thermostat housing, hoses, etc. Full cooling system replacement basically.

Its not that hard to replace the water pump, just takes time. I would go with a stewart warner pump and an S54 radiator just for the peace of mind.

I bet you wouldn't have to worry about replacing it for a long time after that. Its not very complicated though, I would just jump into it and get it done one weekend.

Or you can just wait till the coolant runs up your hood and sprays your windshield, thats a good indication that the system needs service.

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2001 Alpine / Schwartz Coupe
2001 Estoril / Estoril Coupe
2001 Steel Grey / Estoril Coupe
1999 Estoril / Estoril Coupe

Sunroofs are for girls.