Once I had the coolant (water + antifreeze) freeze up in the tubes. Not enough antifreeze obviously, and flow stopped. The pump made a bunch of weird noises as pressure built up. This was with -15C coolant.
Another time I froze my BP6 dual CPU setup so hard that the sockets and everything one inch around the sockets froze. Capacitors and all had a nice thick frost layer on them. This was with the sub-freezing coolant and dual peltiers. Took a couple of days to dry it all out, but it still worked.
I have also had lots of condensation drips off of tubing, but I was prepared for most of those.
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