Chevrolet express 2001 用户手册

The rear control works just like the front control. It will
allow second seat passengers to adjust the controls if the
front control is switched to the rear position.

Before using your vehicle’s air conditioning, open the
windows to clear the vehicle of hot air. This reduces the
time it takes for your vehicle to cool down. Then keep
your windows closed for the air conditioner to work at
its best.

You can use MAX A/C with the temperature knob in the
blue area when it’s really hot outside and you need to
cool the inside air quickly. MAX A/C lets in only a little
air from the outside.

If you first use MAX A/C, you can then use A/C with
the temperature knob in the blue area, as soon as the
vehicle has cooled down, so outside air will be going
through your vehicle.

If your vehicle has rear air conditioning, setting it on 
LO may enhance front A/C performance by allowing
trapped refrigerant in rear lines to circulate.

When the air conditioning is on, you may notice a slight
increase or decrease in engine speed, due to compressor
operation. This is normal because the system is 
designed to cycle the compressor on and off to keep 
the desired temperature.