I have a 2006 GS 300. When the heater is on, the driver-side air vents blow cold. I've replaced a driver side servo motor and plan to do a reverse heater core flush today or tomorrow. I've not been able to find a diagram about the air mix servo motors in the 3rd Gen GS models. When I was replacing one the other day, it appeared that there as another one right above. Does anyone have a diagram or know anything about this? A post I found about 2nd Gen GS models says there is one air mix servo above the driver side floorboard. Is there a second one in Gen 3s? (Just wondering if I need to replace the other one to fix my problem.)