Were is the thermostat for a dodge 1500 5.7 hemi?

The thermostat for a Dodge 1500 5.7 Hemi is located on the engine block, at the rear of the engine, near the firewall. It's usually fairly well hidden and you'll need to remove some components to access it, such as the upper radiator hose or possibly some other components depending on the year. A repair manual specific to your year and model Dodge 1500 is highly recommended to pinpoint its exact location and for the proper procedure for replacing it. Accessing it without a manual can be difficult and might lead to unintended damage.