I went through the same thing in the first 2 weeks I had the car. Fix for me was the one on the left that's not a lot of fun to get to. Part # was the same for the one right behind the glove box so I tried that one first, didn't work, then did the one on the left and it fixed it. Should be easy to tell, if you take the actuator off, change some settings, and it doesn't move - there's your bad actuator.