What to do if cooling system freezes due to lack of antifreeze?
Cry a little first, then kick yourself for not checking it, after that's it's done, the best thing to do is put it some place warm for a day or two and wait for it to thaw out, then you can see how much damage was done, ie heater core, radiator, freeze plugs, broken block, broken head, split hoses, etc. Every once in a while a person gets lucky and squeaks by without any damage. Now I know someone is going to say just take the belts off and try to start it, but I have seen many late model engines ruined going that direction, so play it safe and put it someplace warm.
Nature froze it, let nature thaw it. Then, sincerely, best of luck. Hope the freeze plugs did their job and saved the block.
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