latio water pump don't give way so easily,renew it when there's sign of water leak,if it really leak,it's only slight slippage.not like last time,coolent will dripped out from the water pump like tap dripping water when it start to leak.but if u wanna change it due to high miledge,by all means(160,000km and about.)i got lobang changing it for less than $450 for parts and labour.(thermostat,water pump and coolent)