I didn't get any action, taking cover just put you at 5 initiative - and you still need an action. spending edge for inferno is not an action.
By the way, your edge spending helped,
the car took 11 physical damage - one more hit will explode it and it is at -3 for all actions and limit as it is badly hurt.
Mechanically it means that its limit for running you over goes from 6 to 3 - so now it is less dangerous to you. (The rigger is likely to get all 3 hits, but cannot go over 3 because the car is badly damaged).