Running Cars On Water - HHO Water Powered Cars I seem to be running hot. What should I do? Flush the system, check for calcium deposits inside the radiator and tubes and check the thermostat. Using destilled water in your mixture will prevent any deposits from happening. Check whether you have the right pump. Some aftermarket pumps have smaller impellers and therefore do not pump adequately. Check whether the bottom radiator hose collapse when...... Similar Editorial : Running Your Own Race by Elena Fawkner. | Source : Club Car Parts