I've been having quite a time finding this problem with freezing up. I have a mm2 and while plowing last week it froze up. It happene a few times until it wouldn't work at all. The motor was wining and plow wasn't moving. Si I changed the fluid in the system. There was fisher fluid in it that was very clean, not milky or cloudie at all. I supported the plow and moved the rams in and out, I got it all out and am having the same problem when the temp drops below zero. A friend told me it might be a little water getting in the solenoid and preventing it from doing it's thing....any thoughts?