Ok, my 13 Sierra has started this over the weekend. As soon as the engine starts the electric fans come on and run the entire time that the truck is running, even in the morning when its only around 60 degrees. I am thinking that it might be a relay or something like that but just wanted to see if any of you guys have had this problem to. Not sure if it is related but the AC light just flashes also and the AC compressor will not kick in, not sure if this is related or not.