There are 7 choices

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automatic temperature control (opt CJ2)
- heated and ventilated (opt KQV)
  - ID 85796671
  - ID 86544531
- heated only seat
manual temperature control (opt C67)
- rear defrost (opt C49)
  - ID 86598521
  - ID 86783000
- Without rear defrost
  - ID 85744841
  - ID 86598520

Heater and A/C controls for 2025 GMC Sierra 3500 HD

Fits: manual temperature control opt C67 rear defrost opt C49 ID 86783000 (change)

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