Mode Control Knob

The mode control knob is located on the right side of the HVAC control head. The following are the eight different modes:
^ OFF
^ MAX
^ A/C
^ BI-LEVEL A/C
^ VENT
^ HEATER
^ DEFROST/BLEND
^ DEFROST

OFF
The following actions occur when the knob is in the OFF position:
^ The blower motor does not operate.
^ Electrical power is not supplied to the blower motor.
^ An A/C request signal is not sent to the Powertrain Control Module (PCM).
^ A small amount of air is forced into the HVAC module by the forward movement of the vehicle. The air is discharged through the heater and defrost outlets.

MAX
The following actions occur when the knob is in the MAX position:
^ An A/C request signal is sent to the PCM.
^ The blower motor operates in one of four blower motor speed control settings.
^ Air is discharged only from the instrument panel air outlets.
^ In order to provide MAX A/C, most of the air entering the HVAC module is taken from the vehicle interior (re-circulated). This interior air is cooler than the outside air. MAX is the only setting at which the air is re-circulated.
Use the MAX setting when the following conditions exist:
^ High temperature
^ High humidity
^ The outside air has an objectionable odor

A/C
The A/C setting functions the same as the MAX setting, except that only outside air enters the HVAC module. There may be a slight reduction of blower noise compared to the MAX setting because the re-circulation valve (door) is closed.

BI-LEVEL A/C
The following actions occur when the knob is in the BI-LEVEL A/C position:
^ An A/C request signal is sent to the PCM in order to allow the blower motor to operate in one of four settings.
^ Only outside air enters the HVAC module.
^ Air is distributed through the instrument panel outlets and the floor outlets.
^ A small amount of air is distributed to the defrost outlet.

VENT
The VENT setting does not activate an A/C request signal but allows the blower motor to operate normally. The VENT setting is one of two economy settings (other than OFF) in which there is no A/C request signal. Air is discharged through the instrument panel outlets only.

HEATER
The HEATER setting functions the same as the VENT setting, except that most of the air is discharged through the floor outlets with a small amount of air discharged through the defroster outlets. Use the HEATER setting for cold weather operation unless windshield or side window defogging/defrosting is required.

DEFROST/BLEND
The following actions occur in the DEFROST/BLEND setting:
^ The blower motor operates.
^ An A/C request signal is sent to the PCM.
^ Air is discharged through the defroster and floor air outlets.
The DEFROST/BLEND setting provides greater passenger comfort than the DEFROST setting, but it is not as effective in defogging/defrosting the windshield and side windows.

DEFROST
The DEFROST setting functions the same as the DEFROST/BLEND setting except that most of the air is discharged through the defroster outlets. A small amount of air goes through the heater and side windows defoggers.