There are 5 choices

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AC
- electronic control (opt C68)
  - Celsius display (opt U34)
  - Without Celsius display
- manual control (opt C60)
  - rear defrost
  - Without rear defrost
Without AC

Heater and A/C controls for 2001 GMC Sierra 3500

Fits: AC electronic control opt C68 Without Celsius display (change)

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