HVAC Temperature Sensor?

EddieC said:

Recently our 2008 Tahoe dual HVAC system needs the heat controls turned way up (80 degrees) ti get hot air from the system.
I am assuming that there is a temperature sensor somewhere in the cabin that might be needing attention or replacement.
If that could be the problem, where is it.
Any other input will be appreciated.

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Doubeleive said:

headliner above the 2nd row passenger seat, looks like a little mic grill. they run about $25-30 online, you can access it by pulling the headliner down enough to reach in there and unclip it.

https://www.amazon.com/Temperature-Aspirator-Chevrolet-Silverado-Avalanche/dp/B0DHK7VQG8/ref=sr_1_1_sspa?crid=137EL5KENRNNX&dib=eyJ2IjoiMSJ9.P9N-IHilqyY4PDhqv-NWXD1xkJy8OeHw1qdoo4oLGk0wt0oMbrsuJ6rrlPCp6rkpE2wsXfjnoqCc_UKEWA0sMj0EjNjCq4Dh97oWFB8PzyDiSuMZFZoraCy8sz_zz8QDwvggtOKEFXyHFk_ZjtnbzvoW0vsd3VeUK-0VewYn_Rs1MP_untJIt8cC960vMTSC.KO4F1bvuSwX07WqD1yUnM-dz_EGbhk-R8upYOM1pF4w&dib_tag=se&keywords=22834330&qid=1730249453&sprefix=22834330%2Caps%2C288&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1

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EddieC said:

I see that sensor grille at the driver's side headliner, not the back seat.
I got the new sensor in but I will warn that anyone trying that needs to be prepared to lose some skin on the hands.
The is very little slack in the wire so I had to really squeeze in there and the headliner is really resistant to giving work space.
I had to pull the wire out of the headliner grill at the sensor location, get a hand all the way in, sensor in hand, an rotate the sensor so the wire socket faced down out of the headliner to get the wires in using needle nose pliers to guide them into the sensor socket.
It's worse than trying to get a sparkplug in working in a blind spot.

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