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Pinpoint Test M: HVAC Functions Verification

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Diagnose any HVAC module DTCs before carrying out the following pinpoint test.
NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to PCM DIAGNOSTIC TROUBLE CODE INDEX 
  1. M1 CHECK THE BLOWER MOTOR OPERATION 
    • Key in ON position.
    • 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  M2.
    2. NO  : If the blower motor does not operate in any setting, go to Pinpoint Test R .

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

  2. M2 CHECK AIRFLOW OPERATION 
    • Select the highest blower motor setting.
      • NOTE: Refer to 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  M3.
    2. NO  : Go to Pinpoint Test L .
  3. M3 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  M4.
    2. NO  : If the temperature does not get very warm, go to Pinpoint Test N .

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

  4. M4 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  M5.
    2. NO  : If the temperature is warmer than ambient temperature, INSPECT for binding or broken linkage. If no condition is found, INSTALL a new blend door actuator. TEST the system for normal operation.

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

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

  5. M5 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  M6.
    2. NO  : Go to Pinpoint Test O .
  6. M6 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 K .
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