Why is my 2008 Chevy Impala running hot?
The most common reasons a Chevrolet Impala is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat. via
Where do you put water in a Chevy Impala? (video)
https://www.youtube.com/watch?v=DgShoPBC2rs