<p>We had to have timing belts done on an old camry and '99 passat which both had exceeded 100k miles. In both cases, we were advised to do the water pump simultaneously. The labor costs are the big component so it really saves money in the long run. Typically, the manufacturer has a recommended mileage timeframe for these to be done.</p>
<p>FYI, in both cases, we had excellent mechanics who we trusted. (The kind that try to do only what’s needed. And they both are very honest about prioritizing what’s needed when. I felt pretty comfortable proceeding with doing the timing belt and water pump together.</p>