Is there a rear cabin temp sensor?

[UmmScott]

Does my 2000 nbs yukon have a rear cabin temp sensor?

Asking because A, if it does i am not seeing it.
And B, the front and HVAC all works correctly. Front system in auto works correctly, but if i put the rear system in auto it just turns the blower on high speed and doesnt regulate the temperature. Its either full cold or full hot and the blower is on high.
If i manually control it, blower works in all speeds, mode door works in all positions but..
The blend door is odd, it does fully move in full hot and full cold.

Hence why i am asking does the auto operation in the rear unit have a different sensor or does it use the one up front as well?

Thanks guys

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[UmmScott]

I noticed there is a temp sensor in the floor outlet duct in the rear. Does that have anything to do with it?

Or does anyone know where i can find this info out about how the auto mode works for the rear unit?

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