Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

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

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

1. Install a scan tool.
2. With a scan tool, perform the Recalibrate all Motors command in Instrument Panel Module Special Functions.
3. With a scan tool, observe the current DTC list in instrument panel integration module (IPM).

Does the scan tool display any DTCs?

Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information

Go to Step 3

Place the blower motor switch in each speed position.

Does the blower motor operate in any of the speed positions?

Go to Step 4

Go to Blower Motor Inoperative

Does the blower motor operate at the desired speed in each speed position?

Go to Step 5

Go to Blower Motor Malfunction

1. Place the blower motor switch in the maximum speed position.
2. Place the mode switch in the bi-level position.
3. Alternately place the recirculation switch in the outside air and recirculation positions.

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

Go to Step 6

Go to Air Recirculation Malfunction

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

Is the blower motor OFF?

Go to Step 7

Go to Blower Motor Always On

Place the mode switch in each position.

Does the display on the HVAC control module respond correctly to changes in mode selection?

Go to Step 8

Go to Step 16

Place the mode switch in each position.

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

Go Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 9

1. With a scan tool, observe the Htr./Def./A/C Dr. Commanded parameter in the Instrument Panel Module data list.
2. Place the mode switch in each position.

Does the scan tool indicate that the Htr./Def./A/C Dr. Commanded parameter changes for each change in selected mode position?

Go to Step 10

Go to Step 17

Test the ignition 3 voltage circuit for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 11

Test the low reference circuit of the mode actuator for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 12

Test the 5-volt reference circuit of the mode actuator for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

Go to Step 13

Inspect the air delivery system for the following conditions:

Did you find and correct the condition?

Go to Step 21

Go to Step 14

Inspect the mode door and the mode actuator for the following conditions:

Did you find and correct the condition?

Go to Step 21

Go to Step 15

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

Did you find and correct the condition?

Go to Step 21

Go to Step 18

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

Did you find and correct the condition?

Go to Step 21

Go to Step 19

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

Did you find and correct the condition?

Go to Step 21

Go to Step 20

Replace the mode actuator. Refer to Mode Actuator Replacement .

Did you complete the replacement?

Go to Step 21

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Replace the HVAC control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 21

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Replace the IPM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 21

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2