Blend/Mode/RECIRC Door Operation Improper (Dual & Three-Zone)

NOTE: After making any repairs, perform BODY VERIFICATION TEST under VERIFICATION TESTS.

NOTE: All Overcurrent DTCs must be repaired before diagnosing Calibration fault messages.

Turn the ignition on. With the DRBIII®, read active HVAC DTCs. If the DRBIII® displays any active HVAC DTCs, return to the symptom list and choose the symptom(s). See DIAGNOSTIC TROUBLE CODE IDENTIFICATION table. If the DRBIII® does not display any active HVAC DTCs, go to the next step.
Turn the ignition on. With the DRBIII® in HVAC, System Tests, actuate the HVAC Door Recalibration Test, follow scan tool instructions. If the DRBIII® displays any HVAC Door Recalibration fault messages, return to the symptom list and choose the symptom(s). See DIAGNOSTIC TROUBLE CODE IDENTIFICATION table. If the DRBIII® does not display any HVAC Door Recalibration fault messages, go to the next step.
If fault was reported for:
- Mode Door, go to next step.
- Passenger Blend Door, go to step 5.
- Driver Blend Door, go to step 6
- Recirculation Door, go to step 7
- Rear Mode Door, go to step 8
- Rear Blend Door, go to step 9
Start the engine. Turn the blower control to the high speed position. Turn the mode control to each door position for a minimum of 30 seconds and check for airflow from the corresponding vents. If the air flows from the correct vents for each door position, the test is complete. If the air does not flow from the correct vents for each door position, remove door actuator from A/C Heater Housing Assembly. See MODE DOOR ACTUATOR (FRONT) or MODE DOOR ACTUATOR (REAR) under REMOVAL & INSTALLATION in MANUAL A/C-HEATER SYSTEMS in HVAC. By hand, attempt to rotate door actuator in both directions. Also, inspect for disconnected, missing, or broken door actuator linkage.
Start the engine. Turn the blower control to the high speed position. Turn the mode control to the panel position. Move the passenger blend control to the full hot position. Move the passenger blend control to the full cold position in 25% increments, while checking for a change in airflow air temperature coming from the passenger's panel vents. If the airflow air temperature changed with respect to the position of the blend control, test is complete. If the airflow air temperature did not change with respect to the position of the blend control, remove door actuator from A/C-Heater Housing Assembly. See MODE DOOR ACTUATOR (FRONT) under REMOVAL & INSTALLATION in MANUAL A/C-HEATER SYSTEMS in HVAC. By hand, attempt to rotate the door actuator in both directions. Also, inspect for disconnected, missing, or broken door actuator linkage.
Start the engine. Turn the blower control to the high speed position. Turn the mode control to the panel position. Move the driver blend control to the full hot position. Move the driver blend control to the full cold position in 25% increments while checking for a change in airflow air temperature coming from the driver's panel vents. If the airflow air temperature changes with respect to the position of the blend control, the test is complete. If the airflow air temperature does not change with respect to the position of the blend control, remove door actuator from A/C-Heater Housing Assembly. See MODE DOOR ACTUATOR (FRONT) under REMOVAL & INSTALLATION in MANUAL A/C-HEATER SYSTEMS in HVAC. By hand, attempt to rotate the door actuator in both directions. Also, inspect for disconnected, missing, or broken door actuator linkage.
Start the engine. Turn the blower control to the high speed position. Turn the mode control to the panel position. Make sure that recirc is switched off (status indicator not illuminated). Press the recirc switch on (status indicator illuminated). The sound of the air flowing through the ducts should get louder as the recirculation door opens to bring in recirc air. If the sound of the airflow gets louder after pressing the recirc switch on, the test is complete. If the sound of the airflow does not get louder after pressing the recirc switch on, remove door actuator from A/C-Heater Housing Assembly. See MODE DOOR ACTUATOR (FRONT) or MODE DOOR ACTUATOR (REAR) under REMOVAL & INSTALLATION in MANUAL A/C-HEATER SYSTEMS in HVAC. By hand, attempt to rotate the door actuator in both directions. Also, inspect for disconnected, missing, or broken door actuator link age.
Start the engine. Turn the rear blower control on the A/C-Heater Control Module to the rear control position. Turn the rear blower control on the Rear A/C-Heater Control to the high speed position. Turn the rear blend control to the full cold position and check for airflow from the corresponding vents. Turn the rear blend control to the full hot position and check for airflow from the corresponding vents. If the air flows from the correct vents for each door position, the test is complete. If the air does not flow from the correct vents for each door position, remove door actuator from Rear A/C-Heater Housing Assembly. See MODE DOOR ACTUATOR (REAR) under REMOVAL & INSTALLATION in MANUAL A/C-HEATER SYSTEMS in HVAC. By hand, attempt to rotate door actuator in both directions. Also, inspect for disconnected, missing, or broken door actuator linkage.
Start the engine. Turn the rear blower control on the A/C-Heater Control Module to the rear control position. Turn the rear blower control on the Rear A/C-Heater Control to the high speed position. Turn the rear blend control to the full cold position. Turn the rear blend control to the full hot position, in 25% increments, while checking for a change in airflow air temperature coming from the vents. If the airflow air temperature changes with respect to the position of the blend control, the test is complete. If the airflow air temperature does not change with respect to the position of the blend control, remove door actuator from Rear A/C-Heater Housing Assembly. See MODE DOOR ACTUATOR (REAR) under REMOVAL & INSTALLATION in MANUAL A/C-HEATER SYSTEMS in HVAC. By hand, attempt to rotate door actuator in both directions. Also, inspect for disconnected, missing, or broken door actuator linkage.