Where is the thermostat on a Peugeot 405?

On a Peugeot 405, the thermostat is typically located in the engine bay, near the engine block, and connected to the upper radiator hose. To access it, you usually need to remove the engine cover and the intake manifold or other components that may obstruct it. It's advisable to consult the vehicle's service manual for specific details and diagrams related to your model year.