Why do you want me to replace my Water Pump when you are replacing my Timing Belt? If you look at the diagram your pump is driven by the timing belt. Usually if you change the water pump at the same time you only incur the additional cost of the pump. If you don’t do it at the same time, and your water pump fails you later, you will be paying that same labor cost again. We want you to maintain your vehicle, for less money not more.
