Where thermostat is on an acura rsx 2003?

In a 2003 Acura RSX, the thermostat is located on the engine block, typically near the top where the upper radiator hose connects to the engine. To access it, you'll need to remove the upper radiator hose and the thermostat housing. Make sure to drain some coolant before removal to avoid spillage. Always refer to a service manual for detailed instructions and safety precautions.