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Where is the thermostat located on 2003 Chevy Cavalier?

The thermostat on a 2003 Chevy Cavalier is located at the back of the engine, on the engine block, behind the water pump. It's not easily accessible; you'll need to remove some components to reach it. You'll likely need to consult a repair manual specific to your year and engine (2.2L or 2.4L) for precise instructions and diagrams.