I've never had a problem in the cold with my rotor but I would suspect that if it was frozen then it likely tripped the thermal which should reset itself as soon as it cools down and, of course, the ice would have to melt off. Depends on the particular rotor though.
Channel Master and year old are positives, but if ice was inside the rotor there is a good chance you might have gear damage. You will just have to wait for 33 degrees and see if it moves.
Channel Master and year old are positives, but if ice was inside the rotor there is a good chance you might have gear damage. You will just have to wait for 33 degrees and see if it moves.