This was the beginning of the failure of my water pump. Months of Check Coolant and adding miniscule amounts of fluid to keep the message off for a couple days. After months, while driving on the freeway...car stuttered slightly ( as if running out of gas ), a minute later I heard a snap, started to pull off freeway and power steering locked up, battery light came on, extreme temp warning. I opened the hood...fan belt had snapped, broke all blades of the fan and they severed all hoses and bore into the radiator. $3,500 to rebuild ENTIRE cooling system and it all started with "Check Coolant". Have your water pump inspected ASAP to avoid this nightmare!