When I got up and tried to start my truck that morning, it was 7 degrees and thank God there was no wind. I said "tried to start my truck". I had a dead battery. I also tried to jump it but it was dead dead dead. With the keys still in the ignition, I went to disconnect the positive terminal and whe I got it loosened, the doors locked automaticlly. I couldnt find the spare and was using the wrong slim jim. I went and got a new battery, put it in, and tried the slim jim again but couldnt get the damn door unlocked. I realized that I had another slim jim in the garage. When I used it, I got the door opened right away. Once we drove to where we had out sets, it was already warming up very nicely. It turned out to be about 24 degrees for a high that day and I was glad that the bad luck ended in my driveway!