I've spent many hours trying to devise a method of actuating the cabin heater valve electrically as I don't want to have the standard Bowden cable passing through a grommet in the firewall. I'm not 100% certain my method will be successful but I'm willing to try. This setup uses an "Actuonix" 12V linear actuator that sadly has a slightly short stroke that needs amplifying via the contraption you can see in the photos. It will be a simple "'on-off" selection via a switch on the instrument panel. We'll see!!!