The thermostat is located on the front of the intake manifold. Follow the upper rad hose to the manifold. It drops behind the alternator. Not a fun place to work but you can remove the thermostat housing and hose connected together.
Usually in a housing located at the engine end of the upper radiator hose I have an 01 Durango with a 4.7 and the thermostat is in the lower radiator hose at the engine end.
The thermostat on a 4.7L is under the housing where the lower radiator hose hooks to the engine.
Should be at the engine end of the upper radiator hose
Try in the housing at the engine end of the upper radiator hose
Contrary to every other car and truck that I have worked on, the 2004 Dodge Durango has its thermostat located on the bottom radiator hose. A close inspection of the bottom hose where it connects to the engine will show you the thermostat housing.
show pic's of replacing thermostat on dodge durango
At the engine end of the upper rad hose. When replacing it make sure the spring goes toward the engine;
The spring side goes into the engine.
Follow the upper radiator hose. Where it attaches to the engine vertically is the thermostat housing. Remove this to access the thermostat. This job is easier if you first remove the alternator and its upper support bracket.
On a 5.9L the thermostat is under the housing that the upper radiator hose hooks to on the engine.
It is under the housing where the lower radiator hose hooks to the engine.
Dodge did not produce the Durango until 1998. It is located on the bell housing on the right side of the engine where the transmission mounts to the engine