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Pinpoint Test K: Insufficient, Erratic Or No Heat

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  1. K1 CHECK FOR CORRECT ENGINE COOLANT LEVEL 
    • Check the engine coolant level when hot and cold.
    • Is the engine coolant at the correct level (hot/cold) as indicated on the engine coolant recovery reservoir? 
    • Yes:  GO to  K3.
    • No:  GO to K2  .
  2. K2 CHECK THE ENGINE COOLING SYSTEM FOR LEAKS 
    • Pressure test the cooling system for leaks. Refer to ENGINE COOLING .
    • Does the engine cooling system leak? 
    • Yes:  REPAIR the engine coolant leak. TEST the system for normal operation.
    • No:  FILL and BLEED the cooling system. REFER to ENGINE COOLING . After filling and bleeding the cooling system, GO to K3  .
  3. K3 CHECK FOR COOLANT FLOW TO THE HEATER CORE 
    • Run the engine until it reaches normal operating temperature. Select the FLOOR position on the control assembly. Set the temperature control to full warm and the blower to the lowest setting.
    • Using a suitable temperature measuring device, check the heater core inlet hose to see if it is hot.
    • Is the heater core inlet hose hot? 
    • Yes:  GO to K4  .
    • No:  REFER to ENGINE COOLING to check cooling system function.
  4. K4 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE 
    • Using a suitable temperature measuring device, measure the heater core outlet hose temperature.
    • Is the heater core outlet hose temperature similar to the inlet hose temperature (within approximately 6-17°C [10-30°F])? 
    • Yes: For EMTC systems  , GO to PINPOINT TEST O  and diagnose for inoperative blend door.

      For DATC systems  , GO to PINPOINT TEST P  and diagnose for inoperative blend door.

    • No:  INSTALL a new heater core. TEST the system for normal operation.
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