Where is a thermostat housing on a peugeot 407 hdi?

The thermostat housing on a Peugeot 407 HDi is typically located near the engine block, on the front side of the engine, where the upper radiator hose connects. It's usually situated towards the right-hand side when facing the engine from the front. Accessing it may require removing some components, such as the air intake or various hoses, for better visibility and maneuverability. Always consult the vehicle's service manual for specific details and diagrams.