Thanks. I left the climat control in auto turned the ignition off then disconnected the neg. lead to the battery for a few minutes. When I reconnected it then turned the ignition key forward I heard what seemed to be a series of dampers opening and closing and noises behind the dash. The heat worked after that. Then stopped working 2 days later. I repeated the process and it is still working after another 2 days. Does this recalibrate itself? And what if it keeps occurring? I am going to replace the sending unit for th fuel gage soon too. Thanks for the reply.