Do you have the automatic climate control? If so, do the self test below. My AC is acting up too and the self test shows I have a bad driver side blender actuator- code 6622. From the research I've done this is a common part to fail.
HVAC MODULE - EATC ON-DEMAND SELF TEST
The HVAC Module - EATC On-Demand Self Test will retrieve on-demand (hard fault) DTCs only, it will not retrieve continuous DTCs. Continuous DTCs can be cleared when exiting the HVAC Module - EATC On-Demand Self Test. Make sure to retrieve continuous DTCs by carrying out the HVAC Module - EATC - Retrieve Continuous DTCs procedure before clearing any continuous DTCs.
- The HVAC Module - EATC On-Demand Self Test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A scan tool must be used to retrieve these concerns.
- The HVAC Module - EATC On-Demand Self Test will detect concerns in the system control functions and will display on-demand (hard fault) DTCs for concerns that are present during the self-test. The vehicle interior temperature should be between 4?C-38?C (40?F-100?F) when carrying out the self-test. If the temperatures are not within the specified ranges, false DTCs may be displayed.
- The self-test can be initiated after cycling the ignition switch from OFF to ON. Normal operation of the climate control system stops when the self-test is activated.
- To enter the self-test, press the OFF and DEFROST buttons simultaneously and release, then press the AUTO button within 2 seconds . The display will show a flashing blower icon for 20 seconds , after which all vacuum fluorescent segments will be displayed if there are no on-demand DTCs present. If DTCs are present, the HVAC module - EATC will display "00 00" and then on-demand DTCs. Record all DTCs displayed.
- If any DTCs appear during the self-test, carry out the diagnostic procedure. Refer to the HVAC Module DTC Chart and follow the ACTION for each DTC given. See: Diagnostic Trouble Code Tests and Associated Procedures\HVAC Module DTC Chart
- If a condition exists, but no DTCs appear during the self-test, GO to Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Incorrect Operation. See: Symptom Related Diagnostic Procedures
- To exit the self-test and retain all DTCs, press any button except DEFROST. The HVAC module - EATC will exit the self-test and retain all DTCs.
- To exit the self-test and clear all DTCs, press the DEFROST button. The HVAC module - EATC will exit the self-test and all DTCs will be cleared.
- Always exit the self-test before powering the system down (system turned OFF). Once the self-test is exited, the ignition switch must remain ON for at least 30 seconds to allow the door actuators to automatically recalibrate.
- Continuous DTCs will be deleted after 80 ignition switch ON cycles after the intermittent fault occurs.
