Pinpoint Test K: HVAC Functions Verification

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. 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 DTC Chart.

K1 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 K2.
2. NO : Electronic Manual Temperature Control (EMTC) systems, If the blower motor does not operate in any setting, go to Pinpoint Test R .
  Electronic Automatic Temperature Control (EATC) /Dual Automatic Temperature Control (DATC) systems, If the blower motor does not operate in any setting, go to Pinpoint Test T .
  
  EMTC systems, If the blower motor does not properly change speeds or shut OFF, go to Pinpoint Test S .
  
  EATC /DATC systems, If the blower motor does not properly change speeds or shut OFF, go to Pinpoint Test U .
K2 CHECK AIRFLOW OPERATION
- Select the highest blower motor setting.
- 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 K3.
2. NO : Go to Pinpoint Test I .
K3 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 K4.
2. NO : If the temperature does not get very warm, go to Pinpoint Test L .
  EMTC systems, If the temperature does not change at all, go to Pinpoint Test P .
  
  EATC /DATC systems, If the temperature does not change at all, Go to Pinpoint Test Q .
K4 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 K5.
2. NO : EMTC systems, If the temperature is warmer than ambient temperature, go to Pinpoint Test P and diagnose for inoperative blend door.
  EATC /DATC systems, If the temperature is warmer than ambient temperature, go to Pinpoint Test Q 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 O .
  
  If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch does not cycle, go to Pinpoint Test N .
K5 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 K6.
2. NO : Go to Pinpoint Test M .
K6 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 H .