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Originally Posted by kathyricks

Depends on vehicle usage. Toyota water pumps usually last 150-250,000 miles if the owner drives alot (20,000+ miles per year and mainly on the highway). And especially if the owner uses Toyota brand antifreeze at replacement time because it's free of abrasive silicates that can wear the water pump seal and also contains a good dose of molybedenum lubricant.

The water pump of my 255,000 mile 1989 Toyota Corolla is getting noisy now so I need to replace it for the first time in 19 years (the car was built in November 1988)

You make a good point, however I still stand by my first statement of it's silly not to change it out while your already in there. That is just my opinion though