ambient air duct sensor

[boaterbob]

Can someone tell me where the ambient air duct sensor is located in my 2004 Yukon Thanks

 

[kses123]

Which one?

 

[boaterbob]

I thought it was the supposed to be in the heater air duct some place n the vehicle. One of the local parts guys told me I didn't have that one since my truck has dual climate control.. Anyway put in new hvac air door control motor and everthing seems good!! Now just one more fix and I'm back to new. Seal between trans and transfer case leaking into transfer case. is it just usually the seal or further problems like a bearing or busching worn knocking the seal out???