Thank you for the explanation. I understand how the speed of the fan is adjusted with those buttons ("AIR"), it is relatively normal, but how the "TEMP" is adjusted? In those old cars the regulation of the heating was maintained by manual rotation of the valve on radiator. This is done by some servo in Regata?
BTW - it is very strange. I would expect that air-condition should have buttons while heating would have levers. In regata it is vice-versa