Schematic Reference: HVAC Schematics

DEFINITION: Air does not flow correctly from the air distribution outlets.

Did you perform the HVAC Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - HVAC Systems - Automatic

2

1. Turn ON the ignition, with the engine OFF.
2. Turn OFF the HVAC controls.

Is the blower motor in the OFF position?

Go to Step 3

Go to Blower Motor Always On

3

Place the blower motor control in each speed position.

Does the blower motor operate at all?

Go to Step 4

Go to Blower Motor Inoperative

4

Does the blower motor operate correctly in each speed position?

Go to Step 5

Go to Blower Motor Malfunction

5

1. Place the blower motor control in the maximum speed position.
2. Place the mode controls in the bi-level position.
3. Alternatively, place the recirculation switch in the outside air position and in the recirculation position.

Does the recirculation door move from the outside air position to recirculation position?

Go to Step 6

Go to Air Recirculation Malfunction

1. Install a scan tool.
2. Select the display DTCs function for the HVAC Control Module.

Does the scan tool display any DTCs?

Go to Diagnostic Trouble Code (DTC) List

Go to Step 7

Place the mode controls in each mode position.

Does the air flow from the correct air distribution outlets for each selected mode position?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 8

8

1. With the scan tool, observe the Selected Air Mode parameter in the HVAC Control Module data list.
2. Place the mode controls in each mode position.

Does the scan tool display the correct state for each selected mode?

Go to Step 10

Go to Step 9

Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 11

10

1. Inspect the air distribution system for the following conditions:

•	A restricted air filter in the passenger compartment

•	An obstruction that restricts airflow

•	Air leaks.

•	Misaligned ducts.

2. Perform any necessary repairs.

Did you complete the repair?

Go to Step 12

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Important: Perform the calibration procedure for the HVAC control module.

Replace the HVAC control module. Refer to HVAC Control Module Replacement .

Did you complete the replacement?

Go to Step 12

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3