About a month ago, in very cold weather, I started my car and the blower motor kept turning on and off. I could hear a loud "click" behind the dash panel and the recirculation button would flash on and off. After a few minutes it settled down and worked. A week later, it happened again, except the fan turned off. Stopped at a light, I turned the car off and on and the fan turned on without any further problems during that drive. It has happened a few times since, but this morning the fan was running, but blew cold air the whole time. The temps were good and normal, so its not a stuck open thermostat, and again, when I shut the car off and restarted, bang, warm air.

Is there some kind of relay switch behind the dash that may be causing the problem? I don't want to pull it apart without having some idea of what I'm looking for. Any ideas would be greatly appreciated.

Thanks!
Michael