Where is fill line on radiator overflow tank a 2003 Jeep Liberty?

The fill line on a 2003 Jeep Liberty's radiator overflow tank isn't always a clearly marked line like some vehicles. Instead, it's usually indicated by maximum and minimum markings, often just imprinted on the side of the tank itself. Look for markings that say "MAX" (maximum) and "MIN" (minimum). The fill line is the MAX marking. You should fill the coolant to the maximum level.