Where is the thermostat located on a Chevy Cavalier Z24?

The thermostat on a Chevy Cavalier Z24 (like most vehicles) is located within the engine block, under the intake manifold. It's not easily accessible without some mechanical work. You'll need to consult a repair manual specific to your Cavalier's year to get precise instructions on its location and how to replace it, as the exact placement can vary slightly depending on the year.