Where is the thermostat for a 2002 Cadillac Seville STS?

The thermostat for a 2002 Cadillac Seville STS is located in the engine compartment, specifically on the front of the engine near the water pump. To access it, you'll typically need to remove the upper radiator hose and the thermostat housing, which is bolted to the engine. It's important to ensure the engine is cool before attempting to replace the thermostat to avoid burns from hot coolant.