I guess you mean to create some flow of air? I think the operation has changed a bit with the T6 and mine tends to stop the fan once the desired temperature has been attained.... So I don't think it will work, but hey, at 37C, what have you got to lose?
I do trust you mean the parking heater, via the control panel. That won't flatten your engine battery but will use up power that you may need for your fridge if you are not on hook up.