I purchased a '11 Tundra and unfortunately, the seller didn't inform me of a broken AC blend door. AC/Heat was stuck on defrost. Common problem I'm finding out. Anyway, found a salvage yard online that shipped me a gear that goes on one of the servo controlled flapper doors on the drivers side. Also ordered a new servo plate with both the upper and lower servos. I was able to connect the 2 wire connectors to the servo motors and test everything using the Climate Control knobs. Installed the plate/servos and something was misaligned. Removed the servo plate, tested it again and it was working fine. Reinstalled it, believing everything was clocked and it went into place nicely. Reconnected the 2 wire connectors and I'm not getting any response. AC still blows cold, blower motor works but nothing else. I removed the servo motors and now I can't get them to do anything. This happened a few times when I was trying to repair the old servo motors but I was able to fix it by removing the positive battery cable and reinstalling. Is this related to the truck ECM being confused about the positions of servos/flapper doors? Should I replace the Temperature control unit? Please help.