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Page 131 of 381

GMC SONOMA 1999  Owners Manual 3-2
Comfort Controls
With these systems, you can control the heating, cooling
and ventilation in your vehicle.
Standard Climate Control System
Fan Control
The knob on the left side of the heating syst

Page 132 of 381

GMC SONOMA 1999  Owners Manual 3-3 Optional Climate Control System
Fan Control
The knob on the left side of the heating system 
control panel controls the fan speed. To increase airflow,
turn the knob clockwise. To decrease airflow