My first car was a 1963 Renault 4L which I remember having rather an effective heater. It was turned on using a tap near the driver's left knee which allowed hot water into a heat exchanger near the floor. There was a horizontally hinged flap under the front windscreen which could be opened so that fresh air over the bonnet was driven into the system. The car was a bit like the Jazz in that it had front wheel drive, five doors and a fold-flat rear bench seat, giving a good load space, which is why I bought it in 1965. Only a three-speed gearbox and 6 volt electrics though!