I just got done replacing the heater core in an 05 Deville. Put the dash back together making sure everything was assembled and plugged in. Filled system with coolant, fired it up let the engine get to normal operating temperature, turned the heat on. To my surprise, I was getting all the hot air I could handle from the passenger side, but, only cold from the driver side. Being that the core is brand new, I suspected that I may have left an actuator unplugged. Checked all my wires, everything seems to be in order. I do have a snapon solus pro scanner, have not retrieved codes yet. My question is, is it common for the driver's blend door actuator to go bad?