Sorry to hear it, Julie, and I hope it shows up! Warming up a car is common, so it's not your dad's fault.
I had a car stolen, too. The first day of my life at university (when I was supposed to move in) I walked outside my brother's apartment to find my Suburban stolen along with everything I owned in it. New computer, monitor, TV, speaker system, Gamecube, games, CD's, etc. It reminded me of Fight Club.
But I was fortunate. I hate clothes shopping, and my suitcase (thank the gods) wasn't in the car
.
Plus the car showed up a month later in front of some old lady's house in terrible condition. The old lady was obviously guilty and we had her whipped. But now we finger the old beast to get her unlocked and use a screwdriver to start her. And somehow despite how ugly she is and how poorly she runs, everyone at college seems to love her.