There are 6 choices

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SUBURBAN 1500
- AC
- Without AC
  - heavy duty heater (opt C42)
  - standard duty heater (opt C41)
SUBURBAN 2500
- AC
- Without AC
  - heavy duty heater (opt C42)
  - standard duty heater (opt C41)

Heater and A/C controls for 1978 GMC Suburban

Fits: SUBURBAN 2500 AC (change)

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