Recently I have noticed that after start up of my 2004 Yukon the indicator light on the recirculation selector button of the climate control panel comes on and stays on. When I push the button to turn it off the light blinks three times and then comes back on. It comes in on hot weather and cold. Does anyone have an idea what could be causing this? I have also had a problem with the AC compressor fuse blowing, but if the light comes on and I install a new fuse the light remains on. Any suggestions would be appreciated.