Where is the thermostat on 4.0 jeep motor?

The thermostat on a 4.0 Jeep motor is located on the front of the engine, behind the water pump. It is attached to the engine block with two bolts and is held in place by a gasket. The thermostat is a small, round device with a spring-loaded valve that opens and closes to regulate the flow of coolant through the engine. When the engine is cold, the thermostat is closed, blocking the flow of coolant. As the engine warms up, the thermostat opens, allowing coolant to flow through the engine and cool it down.