dccory,
Were you able to figure out the problem? I am having the same problem with a Kenmore upright. I had the problem a few weeks ago and I noticed it had ice build-up on the bottom. I cleaned it out and it was working fine until this morning when I saw alot of water on the floor. Now it's blowing cold air again. I'm thinking it could be the thermostat. Please let me know your findings.
Thanks, Vince
mazzov@hotmail.com