Where is the thermostat housing on a 2002 Dodge Intrepid 3.5 engine?

On a 2002 Dodge Intrepid with the 3.5L engine, the thermostat housing is located on the top of the engine, at the rear of the cylinder head, near the firewall. It's generally a relatively easily accessible location, though you may need to remove some hoses to get a clear view and access for replacement. You'll likely see several hoses connected to it.