To dream of antifreeze represents decisions which are proactive or focused on preparedness. Making sure everything is in order before you proceed with a more important decision.
Example: A woman dreamed of pouring oil into an engine where the antifreeze was supposed to go. In real life she had an important decision to make that she felt she was too comfortable putting off. The oil in the antifreeze tank reflected her wish to smooth things over with procrastination and excuses (oil) instead of making necessary preparations for her bigger decision (antifreeze).