I thought it may have been clogged, too, but after it sat in the Sheraton garage for a night or so, I went down and checked it and it worked. I'm assuming that the fluid I used had antifreeze in it, but maybe I assume too much. Doesn't the blue stuff you get out of the bottle have antifreeze in it? PLUS, the temperature outside was flirting around 30 degrees. I've got it in my garage at home now to let the ice melt off. It's usually around 40 degrees in there during the winter. I guess what I'll do is drain the system and start from scratch.