PINPOINT TEST E: UNABLE TO DUPLICATE CUSTOMER CONCERN AND NO DTCs PRESENT

WARNING: This page is about a different car, the 2010 Mercury Milan and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Diagnose any PCM, HVAC module or Air Conditioning Compressor Module (ACCM) DTCs before carrying out the following pinpoint test.

E1 CHECK THE BLOWER MOTOR OPERATION
- Ignition ON.
- 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?
- Yes: GO to E2.
- No: If the blower motor does not operate in any setting, Go To PINPOINT TEST K .
  If the blower motor does not properly change speeds or shut OFF, Go To PINPOINT TEST L .
E2 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?
- Yes: GO to E3.
- No: REFER to CLIMATE CONTROL SYSTEM and DIAGNOSE for incorrect/erratic direction of airflow from outlets.
E3 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?
- Yes: GO to E4.
- No: If the temperature does not get very warm or heat is erratic, Go To PINPOINT TEST H .
  If the temperature does not change at all, REFER to CLIMATE CONTROL SYSTEM and DIAGNOSE for temperature control is inoperative/does not operate correctly.
E4 VERIFY NO A/C COMPRESSOR OPERATION 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?
- Yes: GO to E5.
- No: If the temperature is warmer than ambient temperature, REFER to CLIMATE CONTROL SYSTEM and DIAGNOSE for temperature control is inoperative/does not operate correctly.
  If the outlet temperature is significantly colder than ambient temperature, Go To PINPOINT TEST J .
E5 VERIFY A/C OPERATION 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 operate when the PANEL and A/C button (indicator ON) is pressed?
- Yes: GO to E6.
- No: Go To PINPOINT TEST I .
E6 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)?
- Yes: GO to E7.
- No: Go To PINPOINT TEST G .
E7 CHECK IN-VEHICLE TEMPERATURE/HUMIDITY SENSOR FAN OPERATION
- Make sure the ambient air temperature is above 2°C (35°F).
- Select PANEL mode.
- Press the A/C button (indicator ON).
- Place a piece of tissue within 25 mm (1 in) of the in-vehicle temperature/humidity sensor opening.
  
  Fig 1: Locating Tissue
  Courtesy of FORD MOTOR CO.
- Is the tissue drawn to the sensor opening?
- Yes: GO to E8.
- No: Go To PINPOINT TEST F .
E8 CHECK AUXILIARY COOLANT FLOW PUMP OPERATION
- Allow the vehicle to cool to ambient temperature.
- Start the engine and let the engine idle until it shuts down automatically,
- Select FLOOR mode.
- Set the temperature to the warmest setting.
- Select the highest blower motor setting.
- Does the discharge air temperature closely maintain its warm temperature for an extended period of time?
- Yes: The system is operating normally.
  If sent here for reduced airflow, CHECK the cabin air filter. If the cabin air filter is dirty, INSTALL a new cabin air filter. TEST the system for normal operation. If reduced airflow is still observed or the cabin air filter is clean, Go To PINPOINT TEST L .
- No: Go To PINPOINT TEST H .