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Pinpoint Test K: HVAC Functions Verification

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
  1. K1 CARRY OUT THE MODULES SELF-TESTS 
    • Key in ON position.
    • Carry out the Smart Junction Box (SJB) and PCM modules self-tests. Record the DTCs displayed, if any.
    • Were any DTCs displayed as a result of the self-tests? 
    1. YES  : REFER to the Smart Junction Box (SJB) DTC Chart or PCM DTC Chart. CARRY OUT the necessary diagnosis and REPAIR as required.
    2. NO  : Go to  K2.
  2. K2 CHECK THE BLOWER MOTOR OPERATION 
    • Select PANEL mode.
    • Observe blower motor operation and select each blower motor speed.
    • Does the blower motor operate in all selections and change speed in each? 
    1. YES  : Go to  K3.
    2. NO  : If the blower motor does not operate in any setting, go to Pinpoint Test I .

      If the blower motor does not properly change speeds or shut OFF, go to Pinpoint Test J .

  3. K3 CHECK AIRFLOW OPERATION 
    • Select the highest blower motor setting.
      • NOTE: Refer to Climate Control System  in Description and Operation for proper 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 proper outlets? 
    1. YES  : Go to  K4.
    2. NO  : Go to Pinpoint Test D .
  4. K4 VERIFY TEMPERATURE CONTROL OPERATION 
    • Start the vehicle and allow it to reach normal operating temperature.
    • With the A/C OFF, select PANEL mode.
    • Change the temperature setting from the coldest to the warmest and back to the coldest
    • Does the temperature change between very warm to cool? 
    1. YES  : Go to  K5.
    2. NO  : If the temperature does not get very warm, go to Pinpoint Test E .

      If the temperature does not change at all, go to Pinpoint Test D .

  5. K5 VERIFY THE A/C CLUTCH DOES NOT ENGAGE WITH A/C OFF 
    • With the A/C OFF, select PANEL mode.
    • Select the coldest temperature setting.
    • Is the outlet temperature close to ambient temperature? 
    1. YES  : Go to  K6.
    2. NO  : If the temperature is warmer than ambient temperature, go to Pinpoint Test D  and diagnose for inoperative blend door.

      If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch cycles normally, go to Pinpoint Test G .

      If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch does not cycle, go to Pinpoint Test H .

  6. K6 VERIFY A/C CLUTCH ENGAGEMENT IN THE A/C MODE 
    • Make sure the ambient air temperature is above 2°C (35°F).
    • Select PANEL mode.
    • Press the A/C button (indicator ON).
    • Does the A/C clutch engage when the PANEL and A/C button (indicator ON) is pressed? 
    1. YES  : Go to  K7.
    2. NO  : Go to Pinpoint Test F .
  7. K7 CHECK THE RECIRC OPERATION 
    • Press the RECIRC button (indicator OFF).
    • Select PANEL mode.
    • Select the highest blower motor setting.
    • Observe airflow noise.
    • Press the RECIRC button (indicator ON).
    • Does the airflow noise increase when the RECIRC mode is selected (indicator ON)? 
    1. YES  : The system is operating normally.
    2. NO  : Go to Pinpoint Test C .
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