Where is the thermostat located in a 2003 Cadillac CTS?

In a 2003 Cadillac CTS, the thermostat is typically located within the engine's cooling system, specifically near the engine block, where the upper radiator hose connects to the engine. To access it, you may need to remove the engine cover and disconnect the upper radiator hose. It's important to ensure the engine is cool before attempting to locate or replace the thermostat.