Answer, and give a reason. Why is water used in a car's cooling system?

Heat to warm a body: $Q = mc\,\Delta T$. Water $4186\ \text{J kg}^{-1}\text{K}^{-1}$, ice $2100\ \text{J kg}^{-1}\text{K}^{-1}$, aluminium $900\ \text{J kg}^{-1}\text{K}^{-1}$, iron $450\ \text{J kg}^{-1}\text{K}^{-1}$, copper $385\ \text{J kg}^{-1}\text{K}^{-1}$. Heat capacity of a body $= mc$.