Climate Control Systems
This system is used to control heating, cooling, and ventilation in the vehicle.

- Fan Control
- Air Conditioning (A/C)
- Air Delivery Mode Controls
- Defrost
- TEMP (Temperature Control)
- Rear Window Defroster
- Recirculation
: Turn clockwise or counterclockwise to increase or decrease fan speed, or turn the fan off.
TEMP : Turn the knob clockwise or counterclockwise to increase or decrease the temperature.
Air Delivery Mode Controls: Press
,
,
, or
to change the direction of airflow. The indicator light comes on for the selected mode button.
: Air is directed to the instrument panel vents.
: Air is divided between the instrument panel and floor vents.
: Air is directed to the floor vents, some to the windshield, side window outlets, and second row floor vents.
: This mode clears fog or moisture from the windows. Air is directed to the windshield, floor vents, and side window defrosters.
: Press to clear fog or frost from the windshield faster. Air is directed to the windshield and side window defrosters. The A/C compressor also runs unless the outside temperature is below freezing.
Do not drive the vehicle until all windows are clear.
See Ventilation Louvers.
A/C : Press to turn the air conditioning system on or off. An indicator light comes on to show that A/C is on. The A/C indicator light will remain on even if the outside temperature is below freezing and the compressor does not operate. If the fan is off, A/C will not start.
: Press to turn on recirculation. The indicator light comes on. Recirculated air is used for rapid cooling inside the vehicle. It can also be used to reduce outside air and odors entering the vehicle.
Rear Window Defroster
The rear window defroster uses heated grid lines to remove fog from the rear window.
: Press to turn the rear window defroster on or off. The indicator light on the button comes on to show that the rear window defroster is on.
The rear window defroster only works when the ignition is on. The defroster turns off if the ignition is off or in the ACC/ACCESSORY position.
Heated Mirrors: If equipped with heated outside mirrors, the rearview mirrors are heated to help clear fog or frost from the mirror surface when the rear window defroster button is pressed. See Heated Mirrors.
Test yourself
A quick GMC Terrain quiz: every answer comes with an explanation and a link to the manual page.