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A lack of coolant in teh passages would actually reduce the possibility of the block cracking. So don't worry about that.
As far as the bolt, if you own a drill you can take care of it yourself. Get a good bit set, start small, make a pilot hole to guide you down the dead center of the broken bolt. The go up in size by small increments until what is left of the bolt is thin enough that you can pull the shreds out with a pick or a screw driver. If you are patient, you may be able to get it out without having to retap. If not, just get a tap and go up a bolt size or so from what it was.
It really isn't a big deal, just take your time.
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