Where is the thermostat located on a 2001 Chevy Monte Carlo SS?

The thermostat on a 2001 Chevy Monte Carlo SS is located on the engine, at the back of the engine block, near the water pump. You'll likely need to remove some components to access it easily. It's not readily visible without some disassembly. A repair manual specific to your vehicle's year and engine would be helpful in pinpointing the exact location and guiding you through the removal and replacement process.