Hummer H2 Automobile User Manual


 
3-6
Automatic Operation
Press the AUTO button to set the system to automatically
control the air delivery mode, fan speed, air temperature
and recirculation operations.
Pressing this button when the system is off will turn the
system on.
When AUTO is selected, the air conditioning operation
and air inlet will be automatically controlled. The air
conditioning compressor will run when outside
temperature is over approximately 40 F (4 C).
The air inlet will normally be set to outside air. If it’s
hot outside, the air inlet will automatically switch to
recirculated inside air to help quickly cool down
your vehicle.
To find your comfort setting, start with a 74 F (23 C)
temperature setting and allow about 20 minutes for the
system to regulate. Turn the driver’s or passenger’s side
temperature knob to adjust the temperature setting as
necessary. If you choose the temperature setting of
60 F (15 C), the system will remain at the maximum
cooling setting. If you choose the temperature setting of
90 F (32 C), the system will remain at the maximum
heat setting. Choosing either maximum setting will not
cause the vehicle to heat or cool any faster.
Be careful not to cover the sensor located on the top of
the instrument panel near the windshield. This sensor
regulates air temperature based on sun load.
To avoid blowing cold air in cold weather, the system
will delay turning on the fan until warm air is available.
The length of delay depends on the engine coolant
temperature. Pushing the fan switch will override this
delay and change the fan to a selected speed.
Air Conditioning
On hot days, open the windows long enough to let hot
inside air escape. This reduces the time it takes for your
vehicle to cool down. Then keep your windows closed
for the air conditioner to work its best.
On cool, but sunny days while using manual operation
of the automatic system, use bi
-level to deliver warm air
to the floor and cooler air to the instrument panel
outlets. To warm or cool the air delivered, turn the
temperature knob to the desired setting.
In AUTO mode the system will cool and dehumidify
the air inside the vehicle. Also while in AUTO mode,
the system will maximize its performance by using
recirculation as necessary.