When I turn the key off, my fans behind the radiator are still spinning at a high rate. I need some suggestions on what this could be before I take it to chevy. If I can fix on my own I will. It drained my battery as well. Some reading is saying blower motor module or something has shorted out. Any and all suggestions welcomed and thanks in advance!

 

Try changing the relay for the fan motor with another one that is the same and see if that fixes the problem.