System Components - Control: Controller
WARNING: This page is about a different car, the 2005 Chevrolet Optra5 and 2005 Chevrolet Optra. However, it is still accessible from the selected car via links, so may be relevant.
The operation of the A/C system is controlled by the switches on the control head. This console-mounted heating and ventilation panel contains the following:
Three Rotary Control Knobs
- The Rotary Temperature Control Knob
- Actuates by cable
- Varies the mix of the fresh air from outside the vehicle with the heated air from inside the vehicle to suit individual preference
- Raises the temperature of the air entering the vehicle by rotation toward the right, or the red portion of the knob
- The Rotary Mode Control Knob
- Actuates by vacuum
- Regulates the air distribution between the windshield, the instrument panel, and the floor vents
- The Rotary Blower Control Knob
- Turns on to operate the blower motor at 4 speeds
- Turns OFF to stop the blower
- Operates completely independently from both the mode control knob, that regulates the defroster door, and the temperature control knob
- Changes the fan speed in any mode and at any temperature setting-However, if the rotary blower control knob is OFF, the A/C system is OFF, regardless of the position of the A/C push knob
Three Push Knobs
- The A/C Push Knob
- Controls the A/C
- Turns the A/C on when the push knob is pressed and the indicator lamp is illuminated-The rotary blower control knob must be in 1 of its 4 positions for the A/C to function.
- The Rear Window Defogger Push Knob
- Controls the rear window defogger
- Turns on the rear window defogger when the push knob is pressed and the indicator lamp is illuminated
- The Fresh Air Control Push Knob
- Switches between recirculating passenger compartment air or bringing outside air into the passenger compartment
- Defaults to fresh air mode-The indicator lamp is illuminated when recirculation is selected.
- Operates the inlet air door by vacuum
The electric engine cooling fans are operational any time the A/C control is on. This added feature is part of the A/C controller function and is aimed at preventing excessive compressor head temperatures. It also allows the A/C system to function more efficiently. The operation of the cooling fans is controlled by the ECM through the cooling fan relays.