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

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. 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.

K1 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 K2 .
- 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 .
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?
- Yes: GO to K3 .
- No: GO to PINPOINT TEST M .
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?
- Yes: GO to K4 .
- No: If the temperature does not get very warm or heat is erratic, GO to PINPOINT TEST N .
  If the temperature does not change at all, GO to PINPOINT TEST Q and DIAGNOSE for temperature control is inoperative/does not operate correctly.
K4 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 K5 .
- No: If the temperature is warmer than ambient temperature, GO to PINPOINT TEST Q 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 P .
K5 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 K6 .
- No: GO to PINPOINT TEST O .
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)
- Yes: GO to K7 .
- No: GO to PINPOINT TEST L .
K7 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.
- No: GO to PINPOINT TEST N .