Switchboard for the heat management
Original from 1984, this switchboard controlls the heatpump, the 2 earth collectors and the heat collector on the roof.I worked 1984 with an hp computer with 78 KB RAM and 15 MB harddisk. My VW Passat at this time was with 925 kg total low weight construciton. but the low weight did not stop the car to consume 11 litres for 100km.
But here is a piece of technic from 1984 which is better, than many heating systems built later.