I have this activated on my car from VCDS…..First of all, you have no heater so this won’t work or give you any use in the winter.
What can be useful though, is the ventilation in the summer. I use it to keep the fans going for up to an hour when I’ve left the car, or set the timer for the fans to start 30mins before I’m due back to the car, I say fans as the climate control comes on, but there is no actual air-con without the engine on obviously. But it can just take the edge off getting into a baking hot car on a summer day.
Aux-heating = no use.
Aux Vent: Set to on when you leave the car (running time below is how long it will stay on for)
Set timer: Set a date and time for the fans to kick in when you are away from the car (running time again is how long they stay on for) although annoyingly you can only set and use 1 timer at once, making having 3 a bit pointless..
When the timer is set, it will only actually trigger if the car temperature is warmer than the climate control temperature as well