Where is the thermostat located on a 1999 Dodge Grand Caravan 3.3L?

The thermostat on a 1999 Dodge Grand Caravan 3.3L is located on the engine, at the back of the engine, near the intake manifold. It's generally considered to be a difficult-to-access location, requiring some disassembly to reach. You'll likely need to remove some components to get a clear view and access for replacement. A repair manual specific to your year and engine is highly recommended for detailed instructions.