AC question with a twist. I have a 2008. The front AC comes and goes. When it's out, no fan in front. Replaced all 3 relays, no change. Here's the twist, and a possible clue. Today when I was backing over a curb (construction guy) I got a thump from a rock or something under the engine somewhere and the AC came on like the Fonze had hit it. So, what do you think I thumped that made my fan start working? Any ideas of things I can look into are appreciated, it was 97 again today.