2005 Kia Optima Thermostat

If yo follow the upper radiator hose back to the engine, it will lead you to the t-stat housing. Drain the coolant, remove the upper hose, unbolt the housing, and remove the old t-stat. Reverse the sequence to replace it. NOTE: Pay attention as to how the t-stat is facing when you remove the old one to prevent puting the new one in upsidedown.