General description of the heater (Renault Megane 1)

The heater consists of a blower motor, ventilation deflectors in the center and end sections of the instrument panel, and air ducts leading to the front door windows, to the windshield, and to the front and rear footwells.

The handles on the heater/ventilation control panel, located on the instrument panel, deflect flaps, which allows the incoming air to be mixed into different parts of the system. The flaps are located in the air distributor housing.

Fresh air enters the system through the fresh air box grille located near the windshield. If required, the drawn-in air flow is amplified by a supercharger. The exhaust air is discharged from the car through special channels in the rear of the car. If heating is required, the air is passed through the heater heat exchanger.

Some models are equipped with a handle that switches on the air recirculation mode. In this mode, the supply of outside air to the passenger compartment is stopped. This allows, if necessary, to prevent the penetration of unpleasant odors and exhaust gases into the passenger compartment (for example, in heavy traffic).

Source is located on the website renaultbook.ru