[link|https://www.ifixit.com/User/4225326/gonzalezcarlos.99|gonzalezcarlos.99|new_window=true] could be a failed blend door actuator or AIR MIX CONTROL MOTOR. Check on something like [https://www.youtube.com/watch?v=3qVQRfViG0E|this video] to work on it. Here is the complete HVAC module from the service manual. Page 9 shows you how to run the self-diagnostics for your HVAC control unit. See if that gives you something else. [document|28081]