1993 Buick Regal Owner's Manual - Page 114

The air conditionercompressor operates in all Air Conditioning positions, and the Defrost position when the outside temperature is above 40'F (4.5 "C). Defrost When fog or ice ison the windshield, this setting directs themaximum air flow toward the windshield. Ventilation For mild outside temperatures, when little heating or cooling is needed, press the VENT button. Air will flow through the instrument panel outlets. Use the air outlets to turn on, adjust and turn off the air flow. Adjust the TEMP lever to control the temperature. Heating When outside temperatures are cold, press the button marked HTR and slide the TEMP lever toward HOT to send heated air through the floor outlets. Defog When your windshield is foggy, press the DEFOG button to directmost of the air flow toward the windshield. When it's 50 F ( 10 C) or warmer, the system will provide cooled air. Operate the system in another setting for 30 seconds before pushing this button. This will take moist air out of the system to avoid fogging of the windshield. When it's 50' (10" C) or warmer the system will provide cooled air. Off When the system is off, the ventilation system will allow air to flow through your Buick when the vehicle is moving. 112