GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 Regal (China) 🢒 Body and Accessories 🢒 Lighting Systems 🢒 HVAC Air Delivery System Check

HVAC Air Delivery System Check CJ4

Step

Action

Normal Results

Abnormal Results

1
  1. Start the engine.
  2. Press the front HVAC control assembly OFF button.
    • The outside temperature is displayed.
    • The blower does not run.

Blower Motor Always On

2
  1. Press the HVAC control assembly ON button.
  2. Press the fan control switch to a medium speed.
  3. Place the temperature control to the left (blue area).
  4. Press the Front Defrost button
    • The blower runs at a medium speed.
    • The air flows from the panel outlets.
    • The A/C illuminates.
    • The engine idle speed increases.
    • The air flows from the windshield outlets
    • The engine cooling fan may operate

Air Delivery Improper

3

Place the HVAC control assembly in the VENT position.

The air flows from the panel outlets.

Air Delivery Improper

4

Place the HVAC control assembly in the FLOOR position.

The air flows from the floor outlets.

Air Delivery Improper

5

Place the HVAC control assembly in the Bi-Level position.

The air flows from the panel and floor outlets.

Air Delivery Improper

6

Place the HVAC control assembly in the VENT position.

Outside air flows from the panel outlets.

Air Delivery Improper

7

On the in the HVAC control assembly press the recirculation button.

Inside air is recirculated through the panel and floor outlets.

Air Delivery Improper

8

Press the HVAC control assembly OFF button.
    • The engine idle speed decreases.
    • The air may start to warm.

Air Delivery Improper

HVAC Air Delivery System Check C60

Step

Action

Normal Results

Abnormal Results

1
  1. Start the engine.
  2. Place the fan control switch on the HVAC control assembly to a medium speed.
  3. Place the temperature control to the left (blue area).
  4. Turn the mode selector knob to the VENT.
  5. Press the A/C button.
    • The blower runs at a medium speed.
    • The air flows from the panel outlets.
    • The engine idle speed increases.
    • The compressor turns ON.
    • The air flow becomes cold.
    • The engine cooling fan may operate.
    •  Vacuum System

2

On the HVAC control assembly press the FRONT DEFROST button.
    • The air flows from the windshield vents.
    • The air conditioning compressor will run automatically in this setting unless the outside temperature is below 40°F (4°C).

Vacuum System

3

Place the HVAC control assembly in the FLOOR position.

The air flows from the floor vents.

Vacuum System

4

Place the HVAC control assembly in the Bi-Level position.

The air flows from the panel and floor vents.

Vacuum System

5

Place the HVAC control assembly in the DEFOG position.
    • The air flows from the floor vents, front defroster and side window vents.
    •  The air conditioning compressor will run automatically in this setting unless the outside temperature is below 40°F (4°C).

Vacuum System

6

On the in the HVAC control assembly press the recirculation button.

Inside air is recirculated through the panel and floor outlets.

Vacuum System