I had the car sitting outside for a few weeks. It's been pretty cold recently and the antifreeze mix was mostly water. When I checked everything it just had some slush inside (nothing was frozen solid tho) Did I harm anything? I've heard about cracking the block if it freezes solid? When I got it back home yesterday, I drained the rad, and pulled the lower hose from the water pump and let that drain. I'm sure it still has some in there but will it hurt anything if I leave the car w/o any antifreeze/ water in there all winter? It's not going to be driven, just sitting in the cold.