Pinpoint Test

PERFORM A SELF-TEST ON THE PCM AND HVAC MODULE
1. Ignition ON.
2. Using a scan tool, perform PCM and HVAC module self-tests.
  Are any climate control related DTCs present?
  - Yes: For HVAC module DTCs , REFER to DTC Chart: Heating Ventilation Air Conditioning (HVAC) Module - Electronic Manual Temperature Control (EMTC) .
    For PCM DTCs , REFER to DTC CHART: POWERTRAIN CONTROL MODULE (PCM) .
  - No : GO to 2 .
CHECK THE BLOWER MOTOR OPERATION
1. Ignition ON.
2. Select panel mode.
3. Observe blower motor operation and select each blower motor speed.
  Does the blower motor operate in all selections and change speed in each?
  - Yes: GO to 3 .
  - No : If the blower motor does not operate in any setting, REFER to Diagnostic Routine O: The Blower Motor Is Inoperative .
    If the blower motor does not properly change speeds or shut off, REFER to Diagnostic Routine P: The Blower Motor Does Not Operate Correctly .
CHECK AIRFLOW OPERATION
1. Select the highest blower motor setting.
2. NOTE: REFER to System Operation for correct airflow descriptions.
  
  While observing the airflow, select each of the airflow positions (panel, panel/floor, floor, floor/defrost, defrost).
  
  Is the airflow directed to the correct outlets?
  - Yes: GO to 4 .
  - No : REFER to Diagnostic Routine I: Incorrect or Erratic Direction of Airflow From Outlets .
CHECK THE RECIRCULATION OPERATION
1. With the engine running, press the recirculation button (indicator off).
2. Select panel mode.
3. Select the highest blower motor setting.
4. Observe airflow noise.
5. Press the recirculation button (indicator on).
  Does the airflow noise increase when the recirculation mode is selected (indicator on)?
  - Yes: GO to 5 .
  - No : REFER to Diagnostic Routine H: The Air Inlet Door Is Inoperative .
VERIFY TEMPERATURE CONTROL OPERATION
1. Start the vehicle and allow it to reach normal operating temperature.
2. With the A/C off, select panel mode.
3. Change the temperature setting from the coldest to the warmest and back to the coldest.
  Does the temperature change between very warm to cool?
  - Yes: GO to 6 .
  - No : If the temperature does not get significantly warmer, REFER to Diagnostic Routine J: Insufficient, Erratic or No Heat .
    If the temperature does not change significantly, REFER to Diagnostic Routine N: The Temperature Control is inoperative or Does Not Operate Correctly .
VERIFY THE A/C CLUTCH DOES NOT ENGAGE WITH A/C OFF
1. With the engine running and the A/C off, select panel mode.
2. Select the coldest temperature setting.
  Is the outlet temperature close to ambient temperature?
  - Yes: GO to 7 .
  - No : If the temperature is warmer than ambient temperature, REFER to Diagnostic Routine N: The Temperature Control is inoperative or Does Not Operate Correctly .
    If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch cycles normally, REFER to Diagnostic Routine M: The Air Conditioning (AC) Is Always On - AC Mode Always Commanded On .
    
    If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch is engaged and does not cycle, REFER to Diagnostic Routine L: The Air Conditioning (AC) Is Always On - AC Compressor Does Not Cycle .
VERIFY A/C CLUTCH ENGAGEMENT IN THE A/C MODE
1. Make sure the ambient air temperature is above 2 C (36 F).
2. With the engine running, select panel mode.
3. Press the A/C button (indicator on).
  Does the A/C clutch engage when the panel and A/C button (indicator on) is pressed?
  - Yes: GO to 8 .
  - No : REFER to Diagnostic Routine K: The Air Conditioning (AC) Is Inoperative .
CHECK FOR INSUFFICIENT COOLING
1. Change the temperature setting to coldest (MAX A/C).
2. Press the A/C button if the indicator is not on.
  Does the Air Conditioning (A/C) compressor clutch engage and cycle on/off when the A/C indicator is on?
  - Yes: The system is operating correctly.
  - No : REFER to Refrigerant System Tests .