I had a blinking light on my defrost light ( third switch from the left) on my heater control unit on start up for about 30 seconds then everything works fine.I replaced the control unit and all the blend door actuators still have the issue of blinking if any one has any information how to fix it would be appreciated or if there is a recalibration process I could do. I just can’t seem to find an information on my situation. I just don’t want to go to the dealership if I don have to.