2001 - 2005 Kia Magentis L4-2.4L; FWD. 2001 - 2006 Kia Optima L4-2.4L; FWD. Water Pump. 【A coolant leak near the timing belt】. This can be detected by physically seeing a leak under your car. If the water pump gasket is blown, the coolant can drip out onto the ground.