For 1990-2009 cars

## Control Assembly Description Oldsmobile

The heater and A/C control allows the vehicle operator to communicate with the electronic A/C system. The heater and A/C control includes the following features:

• | Soft touch buttons to select operating modes

• | A temperature increase/decrease knob

• | A fan speed increase/decrease knob

• | A vacuum fluorescent (VF) information display panel

When the park lamps or the headlamps are turned ON, the buttons and the knobs illuminate.

### Temperature Knob

The temperature control performs the following functions:

• | When the system is in the OFF mode, the system turns ON in the AUTO mode when the occupant of the vehicle turns the temperature knob in either direction.

• | When the system is in any mode except OFF, turning the temperature knob one detent performs one of the following actions

- | If the temperature is 19°-29°C (66°-84°F), turning the detent knob in either direction increases/decreases the internal temperature setting by 1 degree.

- | If the temperature is 18°C (65°F), turning the detent knob in a counterclockwise direction decreases the internal temperature setting to 16°C (60°F).

- | If the temperature is 30°C (85°F), turning the detent knob in a clockwise direction increases the internal temperature setting to 32°C (90°F).

A change is the temperature setting signals the heater and A/C programmer to bring the passenger compartment temperature to the new setting. This is done by changing:

• | The blower speed

• | The air discharge location

• | The air discharge temperature

### Fan Speed

Use the fan speed increase/decrease knob in order to manually change the fan speed in the following manner:

• | Turning the fan speed knob 1 detent in a clockwise direction increases the fan speed by 1 level.

• | Turning the fan speed knob 1 detent in a counterclockwise direction decreases the fan speed by 1 level.

• | Turning the fan speed knob all the way will increase/decrease the fan speed to the maximum.

If the system is operating under AUTO fan speed control, turning the fan speed knob in either direction stops the AUTO fan speed control and begins a manual fan speed control.

The fan speed remains constant, unless the driver turns the speed control knob again.

When the system is in OFF mode, turning the fan speed knob in a clockwise direction causes the system to turn on AUTO mode with AUTO fan speed control.

### Mode Selector Buttons

The heater and A/C control has a mode selector button for each of the following operating modes:

• | OFF

• | AUTO

• | PASS

• | UPPER

• | LOWER

• | FRONT DEFROST

• | DEFOG

• | BI-LEVEL

• | A/C

• | RECIRC

• | REAR DEFOG

If the driver presses AUTO, the heater and A/C programmer tests the internal temperature that is selected by the operator and the information that is provided by the system's network of sensors.

The heater and A/C programmer initiates the appropriate air intake point, air discharge points and activate/deactivate the A/C compressor.

#### A/C Control

The A/C button controls the A/C compressor may to turned ON or OFF in manual mode. When the driver presses the A/C button, the A/C LED illuminates. The LED also illuminates if the driver selects DEFOG or FRONT DEFROST. The driver cannot deselect the A/C during the DEFOG or the FRONT DEFROST operations.

#### UPPER

When the driver presses the UPPER button, the UPPER LED illuminates. The current temperature setting displays for 5 seconds. The UPPER button directs air out of the vents.

#### BI-LEV (Bi-level)

When the driver presses the BI-LEV button, the BI-LEV LED illuminates. The current temperature setting displays for 5 seconds. The BI-LEV button directs air out of the heater and the vent outlets.

#### LOWER

When the driver presses the LOWER button, the LOWER LED illuminates. The current temperature setting displays for 5 seconds. The LOWER button directs air out of the floor outlets.

#### DEFOG

When the driver presses the DEFOG button, the DEFOG LED and the A/C LED illuminate. The current temperature setting displays for 5 seconds. The DEFOG button directs air out of both the lower outlets and the defrost outlets.

#### FRONT DEFROST

When the driver presses the FRONT DEFROST button, the FRONT DEFROST LED illuminates. The current temperature setting displays for 5 seconds. The FRONT DEFROST button directs air to the windshield. FRONT DEFROST is a manual mode only.

#### RECIRC (Recirculate)

When the driver pressed the RECIRC button, the RECIRC LED illuminates. The RECIRC button operates in all modes except DEFOG and FRONT DEFROST. Use the RECIRC button in order to recirculate air through the HVAC system from the passenger compartment.

RECIRC operates for approximately 10 minutes before deactivation. The driver may also deactivate the RECIRC function during the ignition cycles or changing to a manual mode.

### Vacuum Fluorescent (VF) Information Display Panel

The vacuum fluorescent (VF) panel provides system operating information for the driver. A 3-digit temperature readout is located near the center of the display. With the system in OFF mode, the outside temperature is displayed continuously.

The driver may display the current temperature setting by selecting any mode except OFF or adjusting the temperature control.

The current temperature setting displays for 5 seconds. The display then returns to the outside temperature.

### Symbols

The word AUTO is located to the right of the temperature display when operating in AUTO mode.

The word OFF is located to the left of the temperature display. When the system is OFF, the words OFF and OUTSIDE illuminate and the temperature displays.

The following buttons have no effect on reactivating the system from the OFF mode:

• | RECIRC

• | A/C

• | REAR DEFOG

At the far left of the display is a fan speed bar graph. This graph activates when the fan speed is in manual mode. The number of bars illuminated indicates fan speed. When the fan is operating at its lowest speed, 1 bar illuminates. When operating at maximum speed, all bars illuminate. No bar segments are illuminated when the system is operating in AUTO mode with AUTO fan speed control.

When the system is turned OFF, the fan speed display area is blank.

## Control Assembly Description Buick

The heater and A/C control allows the vehicle operator to communicate with the electronic A/C system. The heater and A/C control includes the following features:

• | Soft touch buttons to select operating modes

• | A temperature control

• | A fan speed control

• | A rear window defogger

• | A vacuum florescent (VF) information display panel

Each operating mode button (except OFF) contains an LED indicator that illuminates when the operator selects that mode. The rear window defogger also has an LED indicator.

The heater and A/C control assembly includes a vacuum-fluorescent display.

### Temperature Button

The temperature control performs the following functions:

• | When the system is in the OFF mode, the system turns ON in the AUTO mode when the occupant of the vehicle presses temperature UP or DOWN button.

• | When the system is in any mode except OFF, either button performs one of the following actions:

- | If the temperature is 19°-29°C (66°-84°F), pressing WARM/COOL buttons increases/decreases the internal temperature setting by 1 degree.

- | If the temperature is 18°C (65°F), pressing the COOL button decreases the internal temperature setting to 16°C (60°F).

- | If the temperature is 30°C (85°F), pressing the WARM button increases the internal temperature setting to 32°C (90°F).

A change is the temperature setting signals the heater and A/C programmer to bring the passenger compartment temperature to the new setting. This is done by changing:

• | The blower speed

• | The air discharge location

• | The air discharge temperature

### Fan Speed

Use the fan speed button in order to manually change the fan speed in the following manner:

• | Pressing the fan speed button once increases/decreases the fan speed by 1 level.

• | Holding the fan speed button will increase/decrease the fan speed to the maximum.

If the system is operating under AUTO fan speed control, pressing the stops the AUTO fan speed control and begins a manual fan speed control.

The fan speed remains constant, unless the driver presses one of the speed control buttons again.

When the system is in OFF mode, pressing the AUTO button causes the system to turn on AUTO mode with AUTO fan speed control.

### Mode Selector Buttons

The heater and A/C control has a mode selector button for each of the following operating modes:

• | OFF

• | AUTO

• | AIR FLOW

• | VENT

• | RECIRC

• | FRONT DEFROST

• | REAR DEFOG

If the driver presses AUTO, the following actions occur:

• | The heater and A/C programmer tests the internal temperature selected by the operator and the information provided by the system's network of sensors.

• | The heater and A/C programmer then initiates the appropriate air intake point, air discharge points and activates/deactivates the A/C compressor.

#### AIR FLOW

Use the AIR FLOW button in order to change the air flow direction in the vehicle. Selection of the AIR FLOW button when in AUTO mode will lock in the air flow direction that AUTO was controlling. Pressing the AIR FLOW button also activates the VF display for the direction selected. If an air flow direction is currently displayed, pressing the AIR FLOW button selects the next air flow direction, either up or down depending on operator selection. The air flow direction will sequence upward through the following modes:

1. FLOOR
2. FLOOR/MID
3. MID
4. WINDSHIELD/FLOOR

The downward sequence is the reverse of the upward sequence. These are the only air flow directives available through the AIR FLOW button.

#### VENT

When the driver presses the VENT button, the VENT LED illuminates and the system requests that the A/C compressor be turned OFF.

• | The VENT LED illuminates.

• | The system will request that the A/C compressor to be turned off.

The driver may not activate both VENT and RECIRC at the same time.

The VENT button has no effect on the system when the FRONT DEFROST mode is selected.

#### RECIRC (Recirculate)

The main function of the RECIRC button is to limit the amount of outside air that is brought into the vehicle by activating the air inlet valve. When the driver presses the RECIRC button, the RECIRC LED illuminates and the system closes the recirculate door.

• | The RECIRC LED illuminates.

• | The system will close the recirculate door.

The driver may not activate both VENT and RECIRC at the same time.

The RECIRC button has no effect on the system when the FRONT DEFROST mode is selected.

RECIRC operates for approximately 10 minutes before deactivation. The driver may also deactivate the RECIRC function by changing to a manual mode.

#### FRONT DEFROST

When the driver pressed the FRONT DEFROST button, the FRONT DEFROST LED illuminates and the current temperature setting displays for 5 seconds.

The FRONT DEFROST directs air to the windshield. FRONT DEFROST is a manual mode only.

### Vacuum Fluorescent (VF) Information Display Panel

The vacuum fluorescent (VF) panel provides system operating information for the driver. A 3-digit temperature readout is located near the center of the display. With the system in OFF mode, the outside temperature is displayed continuously.

The driver may display the current temperature setting by selecting any mode except OFF or adjusting the temperature control.

The current temperature setting displays for 5 seconds. The display then returns to the outside temperature.

### Symbols

The following arrows appearing in the center of the display indicate the air discharge location relative to the seat:

• | An upper (windshield) discharge arrow

• | A lower (floor level) discharge arrow

• | A middle (instrument panel) discharge arrow

Either one or a combination of these discharge arrows may be illuminated, depending on the current system operating mode. If the system is turned OFF, the area is blank and the display returns to the outside temperature reading.

The driver may display the current temperature setting by selecting any mode except OFF or adjusting the temperature control.

## Control Assembly Description Pontiac

The heater and A/C control allows the vehicle operator to communicate with the electronic A/C system. The heater and A/C control includes the following features:

• | Soft touch buttons to select operating modes

• | A temperature increase/decrease rocker switch

• | A fan speed increase/decrease rocker switch

• | An English/metric display switch

• | The rear defog control switch

• | A vacuum fluorescent information display panel

When the park lamps or the headlamps are turned ON, the buttons and the rocker switches illuminate.

### Mode Selector Buttons

The heater and A/C control has a mode selector button for each of the following operating modes:

• | OFF

• | AUTO

• | AIR FLOW

• | VENT

• | RECIRC

• | FRONT DEFROST

• | REAR DEFOG

If the driver presses AUTO, the following actions occur:

• | The heater and the A/C programmer tests the internal temperature selected by the operator and the information provided by the system's network of sensors.

• | The heater and the programmer initiates the appropriate air intake point, air discharge points and activate/deactivate the compressor.

### Temperature Button

When the system is in the OFF mode, pressing either end of the temperature rocker switch causes the system to turn on in the AUTO mode.

In any mode except OFF, pressing the temperature rocker switch performs one of the following actions:

• | If the temperature is 19°-29°C (66°-84°F), pressing the increase/decrease end of the rocker switch once increases/decreases the internal temperature setting by 1 degree.

• | If the temperature is 18°C (65°F), pressing the decrease end of the rocker switch once decreases the internal temperature setting to 16°C (60°F).

• | If the temperature is 30°C (85°F), pressing the increase end of the rocker switch once increases the internal temperature setting to 32°C (90°F).

A change is the temperature setting signals the heater and A/C programmer to bring the passenger compartment temperature to the new setting. This is done by changing:

• | The blower speed

• | The air discharge location

• | The air discharge temperature

### Fan Speed Button

The fan speed rocker switch changes the fan speed by pressing the increase/decrease end of the rocker switch once in order to change the fan speed by 1 level.

Holding the switch increases/decreases the fan speed until you release the switch or the fan reaches maximum speed.

• | You release the switch

• | The fan reaches the maximum/minimum speed.

If the system is operating under AUTO fan speed control, pressing either end of the fan speed rocker switch stops the AUTO fan speed control and begins a manual fan speed control.

• | Stops the AUTO fan speed control

• | Begins a manual fan speed control

The fan speed remains constant, unless the driver presses the rocker switch again.

When the system is in OFF mode, pressing either end of the fan speed rocker switch causes the system to turn on in AUTO mode with AUTO fan speed control.

### English/Metric Display

Pressing the English/metric display switch serves the following function:

• | Press the English/metric display switch changes internal and the outside temperature reading to metric units.

• | Press the display switch again in order to return the readings to English units.

### Vacuum Fluorescent (VF) Information Display Panel

The vacuum fluorescent (VF) panel provides system operating information for the driver. A 3-digit temperature readout is located near the center of the display. With the system in OFF mode, the outside temperature is displayed continuously.

The driver may display the current temperature setting by performing selecting any mode except OFF or adjusting the temperature control.

• | Selecting any mode except OFF

• | Turning the temperature knob

The current temperature setting displays for 5 seconds. The display then returns to the outside temperature.

### Symbols

The following arrows appearing in the center of the display indicate the air discharge location relative to the seat:

• | An upper (windshield) discharge arrow

• | A lower (floor level) discharge arrow

• | A middle (instrument panel) discharge arrow

Either one or a combination of these discharge arrows may be illuminated, depending on the current system operating mode. If the system is turned OFF, the area is blank and the display returns to the outside temperature reading.

• | This area is blank.

• | The display returns to the outside temperature reading.

The driver may display the current temperature setting by selecting any mode except OFF or adjusting the temperature control.