I have very nice 1999 STS with 148,000 miles. I have one code B1343-Air Inlet Door Movement Fault. I get cold air from passenger vents but warmer air from driver's side vents. I've read search results for over 3 hours now only to get more confused. I removed glove box and both kick panels. I found 3 actuators. One under driver's side dash. One behind passenger side kick panel. And one behind driver's side kick panel which controls the rear air. I was told by local mechanic with a scanner that there is one (maybe 2?) more located deeper into the dash towards the firewall (called Air Inlet/Outlet Actuator Right and Air Inlet/Outlet Actuator Left) which is causing my problem. Is this true? How many actuators does my 99STS have?