sideshowalan wrote:Replaced water pump in a relatives 2008 vibe approx 2 years ago, don't know the mileage....less than 100K. It failed slowly, just got louder and louder over a few months.
No reason to replace alternator or water pump unless they fail.
Water pump will fail by leaking or making loud growling noise, alternator will fail by failing to charge the battery while driving causing a stall.
Replacing your thermostat at the next coolant change wouldn't hurt, also recommend replacing your power steering fluid. Suck out what you can from the reservoir with a turkey baster and replace with dex III transmission fluid. Do that once a week for a month and it will help your power steering rack last longer.
Wife's 2009 vibe with 75,000 on it, started making noise, took to the shop. Alternator and water pump needed replacement, I asked them to do the serpintine belt while at it. They charge about $500 for the whole deal. The mileage is not that high, but the wife has to idle a lot, takes her 45 min. to go 14 miles one way to work. Idle for several light changes at several intersections. The engine probably has wear like it went 150K miles.