GM Service Manual Online
For 1990-2009 cars only

Your vehicle may have this climate control system. The heating, cooling, and ventilation for the vehicle can be controlled with it.


Object Number: 869246  Size: B2

Manual Operation

To change the current mode, select one of the following settings on the right knob.

MAX (Maximum Air-Conditioning): This mode recirculates much of the air inside the vehicle and sends it through the instrument panel outlets. The air-conditioning compressor will run automatically in this setting unless the outside temperature is below 40°F (4°C).

VENT (Ventilation): This mode brings in outside air and directs it through the instrument panel outlets.

BI-LEV (Bi-Level): This mode directs approximately half of the air to the instrument panel outlets, and then directs most of the remaining air to the floor outlets. Some air may be directed toward the windshield.

HTR (Heater): This mode directs most of the air to the floor outlets, with some air directed to the outboard outlets, for the side windows, and some air directed to the windshield.

BLEND: This mode directs half of the air to go to the floor outlets and half to the defroster and side window outlets. The air-conditioning compressor will run automatically in this setting unless the outside temperature is below 40°F (4°C). The right knob can also be used for the defrost mode. Information on defrosting and defogging can be found later in this section.

FAN: The left knob controls the fan speed.

OFF: Turn the knob all the way counterclockwise to turn off the fan.

LO (Low Fan Speed): This setting creates the lowest fan speed.

HI (High Fan Speed): This setting creates the highest fan speed.

DRIVER (Driver's Side Temperature): The lever on the left adjusts the air temperature for the driver's side outlets. Slide the lever up to raise the temperature and down to lower the temperature.

PASSENGER (Passenger's Side Temperature): The lever on the right adjusts the air temperature for the passenger's side outlets. Slide the lever up to raise the temperature and down to lower the temperature.

A/C (Air Conditioning): Press this button to turn the air-conditioning on and off. An indicator light above the button will come on when the air conditioning is on. During daylight hours the interior lighting control might need adjustment to the highest setting in order for the indicator light to be seen. The system will cool and dehumidify the air inside the vehicle when the A/C indicator light is on. On very hot days, open the windows long enough to let hot, inside air escape. This reduces the time for the vehicle to cool down. For a quick cool-down on a very hot day, use MAX with the temperature levers all the way in the blue area. If this setting is used for long periods of time, the air in the vehicle may become too dry. For normal cooling on hot days, use VENT with the temperature levers in the blue area. The system will bring in outside air and cool it. On cool, but sunny days, the sun may warm your upper body, but your lower body may not be warm enough. Select BI-LEV and set the temperature levers to a comfortable setting. The system will bring in outside air and direct it to your upper body, while sending slightly warmed air to your lower body. Push the A/C button for cooling.

Defogging and Defrosting

Fog on the inside of the windows is a result of high humidity causing moisture to form and condense on the cool window glass. This can be minimized if the climate control system is used properly. There are two modes to clear fog or frost from the windshield and side windows. Use the blend mode to clear the windows of fog or moisture and warm the passengers. Use the defrost mode to remove frost or fog from the windshield more quickly. For best results, clear all snow and ice from the windshield before defrosting.

DEF (Defrost): This setting, located on the right knob, directs most of the air through the defroster and the side window outlets. Some of the air is directed to the floor and side window outlets. The air-conditioning compressor will run automatically in this setting unless the outside temperature is below 40°F (4°C). To defrost the window quickly, turn the mode knob to the defrost setting and turn the driver's and passenger's temperature levers all the way to the red area. To warm passengers while keeping the windows clear, use BLEND. Do not drive the vehicle until all the windows are clear.

Rear Window Defogger

(Rear): Press the button to turn the defogger on or off. The rear window defogger will initially run for about 15 minutes. If it is turned on again, the rear window defogger will only run for about seven and one half minutes before turning off. Do not drive the vehicle until all the windows are clear.

Notice: Do not use a razor blade or sharp object to clear the inside rear window. Do not adhere anything to the defogger grid lines in the rear glass. These actions may damage the rear defogger. Repairs would not be covered by your warranty.