General description of the air temperature control system (central injection) (Renault Megane 1)

The system is controlled by a wax thermostat installed in the air filter housing inlet. The thermostat moves a flap that controls the mixing of hot and cold air. When the ambient air temperature is below a certain value, the flap is positioned so that only warm air from the housing on the exhaust manifold enters the filter, but as the ambient air warms, the flap moves, letting in air from outside and closing off the flow of warm air.

If the system is not functioning properly, the air filter housing must be replaced; since it is impossible to replace the valve separately.