I have my engine out my car it’s on a tire and I dumped most antifreeze out the engine but I’m not planning on dropping it back in till weekend.Should I be concerned it’s cold outside temp is 26 here in San Antonio. It’s under a carport and I have a blanket, a moving blanket and a car cover over it. Nothing will fall into it direct just making sure should I put antifreeze in it or doesn’t need it