Where is Thermostat location on 2003 intrepid 2.7 liter engine?

The thermostat on a 2003 Dodge Intrepid with a 2.7L engine is located on the passenger side of the engine, at the back of the engine block. It's often tucked in a somewhat difficult-to-reach spot. You'll likely need to remove some components (like the serpentine belt and possibly some other parts) to gain proper access for replacement. A repair manual specific to your vehicle year and engine will be very helpful in locating it precisely and guiding you through the replacement process.