LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 221 (HVAC Systems - Manual) >> Diagnostic Information and Procedures >> Air Recirculation Malfunction >> Test Description

Test Description

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  This action will calibrate the HVAC actuators and check to ensure the DTCs that set when calibration is performed will be set.
  2. 4:  This step is to ensure that the recirculation actuator is with its calibrated range.
Air Recirculation Malfunction

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? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Recalibrate the motors. Refer to Re-Calibrating Actuators .
  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 in Vehicle DTC Information Go to Step 3 
3
  1. Place the blower motor switch in the maximum speed position.
  2. Alternately, place the mode switch in the Max A/C and Vent positions.
Does the recirculation door move from the recirculation position to the ambient air position?		 - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 4 
4 
  1. With a scan tool, observe the Recirculation Dr. Command parameter in the HVAC data list.
  2. Alternately, place the mode switch in the Max A/C and Vent 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 in Wiring Systems.
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?		 - Go to Step 8  -
7 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 8  -
8 Operate the system in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 3 
scientia non olet · About LEMON Manuals