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Home >> Chevrolet >> 1996 >> Caprice Impala SS >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (HVAC System - Automatic) >> Testing >> Normal System Response Test >> System Response Test

System Response Test

WARNING: This page is about a different car, the 1996 Buick Roadmaster. However, it is still accessible from the selected car via links, so may be relevant.
  1. When A/C-heater control panel OFF button is pressed, EXT TEMP will display ambient temperature. Blower motor does not operate.
  2. When A/C-heater control panel AUTO button is pressed and temperature is set to 60°F (16°C), system is in recirculation mode. Blower motor will operate at high speed. Air will flow from instrument panel outlets. Engine idle speed will increase and A/C compressor clutch will be energized if ambient temperature is more than 35°F (2°C). Outlet air will become cold.
  3. When A/C-heater control panel LO (fan) button is pressed, blower motor speed will reduce until button is released. Blower motor speed will be displayed until button is released. Blower motor will operate at speed attained when button is released.
  4. When A/C-heater control panel HI (fan) button is pressed, blower motor speed will increase until button is released. Blower motor speed will be displayed until button is released. Blower motor will operate at speed attained when button is released.
  5. When A/C-heater control panel ECON button is pressed, A/C compressor clutch will de-energize and outlet air will become warm.
  6. When A/C-heater control panel AUTO button is pressed and temperature is set to 90°F (32°C), system is in heater mode. Blower motor will operate at high speed. Air will flow from floor outlet with some bleed to front and side window defroster outlets and outlet air will become warm.
  7. When A/C-heater control panel AUTO button is pressed and temperature is set to 75°F (24°C), blower motor speed will reduce as in-vehicle temperature approaches 75°F (24°C). A/C-heater system will maintain in-vehicle temperature at about 75°F (24°C).
  8. When A/C-heater control panel DEFOG button is pressed, system will be placed in manual mode. Air will flow from windshield outlet, side window outlets with a 50 percent bleed to floor outlets.
  9. When A/C-heater control panel DEF (front) button is pressed, some air will bleed to heater outlets. Air will flow from windshield outlet and side window outlets.
  10. When A/C-heater control panel REAR DEFOGGER button is pressed, will activate rear defogger for 10 minutes. Pressing REAR DEFOGGER button again during the same ignition cycle, will activate rear defogger for another 5 minutes.
  11. When A/C-heater control panel BLEND button is pressed, system will be placed in manual mode. Airflow will be 50 percent from instrument panel outlets and 50 percent from floor outlets.
  12. When A/C-heater control panel MIDDLE button is pressed, system will be placed in manual mode. Airflow will be 100 percent from instrument panel outlets.
  13. When A/C-heater control panel FLOOR button is pressed, system will be in manual mode. Airflow will be 100 percent from floor outlets.
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