 It drained my battery completely. It took care of that. I recharged the battery. Drove to work the next day. Everything was running fine. Turned the car off. Fan was still running. I thought, okay, it's going to turn off. I fell for it twice. And then basically ran into the fan, continued to run, ran the battery dead, recharged it. So now I've come to the point of unplugging the fans every time I turn my car off and then plugging them back in before I drive.