Where is the thermostat on a 2005 is300 Lexus?

On a 2005 Lexus IS300, the thermostat is located in the engine compartment, specifically at the engine's front, near the water pump. To access it, you typically need to remove the engine cover and some hoses. The thermostat is housed in a housing that connects the upper radiator hose to the engine. Always consult the vehicle's service manual for specific instructions and safety precautions.