Where is thermostat on Peugeot 407 hdi?

The thermostat on a Peugeot 407 HDi is typically located near the engine block, just beneath the intake manifold. To access it, you may need to remove the engine cover and other components that obstruct the area. It's often housed within a housing unit connected to the upper radiator hose. Always consult a repair manual for detailed instructions specific to your model year.