GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 XLR 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Air Recirculation Malfunction

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This action will calibrate the HVAC actuators and check to ensure the DTCs that set when calibration is performed will be set.

    2.

  2. This step is to ensure that the recirculation actuator is with its calibrated range.

Step

Action

Values

Yes

No

Schematic Reference: HVAC Schematics

DEFINITION: Air recirculation is inoperative or always on.

1

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Recalibrate the motors. Refer to Actuator Recalibration .
  4. With a scan tool, observe the current DTC list in Heating and Air Conditioning.

Does the scan tool display any DTCs?

--

Go to Diagnostic Trouble Code (DTC) List - Vehicle

Go to Step 3

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

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

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Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 4

4

  1. With a scan tool, observe the Recirculation Dr. Command parameter in the HVAC Systems Automatic data list.
  2. Alternately place the recirculation switch in the recirculation and outside air positions.

Does the scan tool indicate that the value of the Recirculation Dr. Command parameter changes from the minimum specified value to the maximum specified value?

0-230 counts

Go to Step 6

Go to Step 5

5

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 .

Did you find and correct the condition?

--

Go to Step 8

Go to Step 7

6

Inspect the air distribution system for the following conditions:

    • A restricted passenger compartment air filter.
    • An obstruction restricting air flow.
    • Air leaks.
    • Misaligned ducts.

Did you find and correct the condition?

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Go to Step 8

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7

Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

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Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

 

System OK

Go to Step 3