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Is there any way to determine whether a water pump needs to be replaced before it fails completely? I realize that if it dies, then I'm not going to get far. Am I better off waiting until it does than trying to replace it before that happens? I know it's going to be a fairly expensive repair.

I have a Corolla with 125,000 miles. Could the water pump last another 125,000 miles? I realize that it could die tomorrow, but how likely is that?

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3 Answers 3

up vote 6 down vote accepted

It sounds like you're asking several questions at the same time.

In terms of the symptoms of failure, you don't give a lot of information about your specific car. However, some basics always apply: leaks (especially at the bottom of the timing belt cover) and basic failure to move the coolant (are you overheating this summer?).

In terms of cost, you're looking at a fairly labor-intensive replacement. Have you already replaced the timing belt? That is in the same vicinity as the water pump and, if the mechanic is already replacing the timing belt, that's a good time to take care of the water pump itself.

Finally, in terms of consequences, this part is in the category of things that can bring your trip to a halt. No water pump = no coolant = no driving.

Of course, water pumps generally don't fail catastrophically, exploding in a cloud of coolant vapor. That said, it's going to go eventually. If you're lucky it will last for a while. Time to start setting a little cash aside for the eventual replacement?

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As Bob mentioned, Timing Belt and Water Pump should be done together. Timing Belt you can't wait till it breaks, you have to do it as preventative maintenance so you don't mess up your engine (bent/broken valves). The water pump is going to be right there in the middle of all the timing belt work, so why not spend the extra $50-100 to replace it then instead of paying hours and hours of labor when it starts failing. Plus, good luck replacing the water pump without getting coolant on the timing belt, which then you are supposed to replace the belt. –  ManiacZX Aug 8 '11 at 19:00
    
@ManiacZX, that's an important point - I would never thought of the fact that the belt will likely get contaminated in the process of the pump replacement. –  Bob Cross Aug 8 '11 at 20:16
    
@ManiacZX Are there any Toyota engines that are interference? I'm not familiar with the newest models, but all the older ones were non-interference and some people would choose to skip the timing belt changes as no damage occurs on breakage (just the inconvenience of the breakdown). –  Brian Knoblauch Aug 8 '11 at 20:27
    
@Brian, a little searching around sounds as if Toyota has both, just depends on the engine. My answer was more to the generic cover all. Yes, if you find that you have a non-interference engine you could push it but still doesn't seem like a good idea. It is only every 60-100k miles and is costly to do, so you are better planning ahead for it instead of having to pony up the cash the moment it lets loose. –  ManiacZX Aug 8 '11 at 21:20
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Also, you may not completely fail and just skip a couple teeth on the belt. My engine was like that (although I think it was dealer error on install as the belt was in good shape), I was off by 2 teeth on one gear. After correcting, I've recorded about a 2 MPG increase (from 20-21 to 22-23 MPG) on my car which pays for the parts after about 6 months (did the work myself so no labor). –  ManiacZX Aug 8 '11 at 21:25

I drive a 2006 Camry, and just crossed 95K miles. Although the pump did not fail, it did start foaming around the gasket so I had that taken care of before it got bad. I foresee seals, and gasket failing before the pump does.

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Impossible to say. I can only offer my own anecdotal Toyota experience. I had to have the engine rebuilt on my MR2 at 180,000 miles (due to oil pump failure). The original water pump was still working fine, no leaks, no problems at all at that point. However, since the whole engine was out and being rebuilt, we replaced it. At my 240,000 mile timing belt change, my mechanic (very experienced, and a friend as well) went ahead and replaced the water pump again as a preventative measure as he says that it's rare for Toyota water pumps to make it past 90,000 miles... YMMV I guess. :-)

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+1 for the actual data - can't beat reality when it comes to planning these sorts of things. –  Bob Cross Aug 8 '11 at 14:51

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