1636 2004-2007 Ford Mercury 232 238 256 water pumpWe designed a impeller with an increased vane count and a reduced impeller vane clearance to cool the 232 3. 8L 238 3. 9L and 256 4. 2L Ford and Mercury engines. It achieves greater flow rates, higher head pressure and a more efficient flow. The impeller color is due to Type II Class II military grade surface coating which protects against corrosive fluids. FlowKooler introduced the first hi flow pumps and continues to improve impeller design. Why is