While it may be possible to reuse the water pump, there are several reasons why replacing it is a better option:
- The water pump is driven by the timing belt. If the timing belt fails or breaks, the water pump will likely fail as well, potentially leading to engine overheating.
- The water pump is located near the timing belt, and accessing it requires the removal of several components, including the timing belt cover and possibly the radiator fan. By replacing the water pump at the same time as the timing belt, you can avoid having to disassemble and reassemble these parts twice.
- Water pumps can fail at any time, regardless of mileage or age. By replacing it when you're already replacing the timing belt, you can help ensure that your engine will continue to run properly for many years to come.
Overall, replacing the water pump when replacing the timing belt on a 1999 Subaru is a prudent and cost-effective maintenance measure that can help prevent engine damage and unexpected breakdowns.
