Well, you're going to have to thaw it out. You'll probably just have to wait for warmer weather, or get it into a garage thats (preferably) heated. Ask around and see if any of your friends can help. Once you get it thawed, be sure to run it a bunch to make sure the de-icer is mixed in, and has been run through the lines.
This cold weather up in the Northeast sure seems to be causing a lot of trouble.