Water Pump Fit 02-12 Infiniti G35 G37 FX35 Nissan 350Z VQ35DE VQ37VHR VQ40DE. The water pump plays an important role in your car’s cooling system. Operated by the drive belt, blades on the water pump allow coolant to flow into the engine continually. Although water pumps are built to last, they sometimes break down and require replacement. Timing belt driven water pumps should always be replaced at the same time as the timing belt. Ignoring the replacement of a water pump as a part of scheduled maintenance, could result in major engine failure down the road. You should not wait for your water pump to break, it must be serviced regularly. Be sure to use our water water pump when your car water pump is serviced.