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Pinpoint Test D: Insufficient, Erratic Or No Heat

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. D1 USE THE RECORDED DTCs FROM THE PCM SELF-TEST 
    • Using the recorded results from the PCM self-test:
    • Is DTC P2600 retrieved? 

    Yes:  REFER to INTRODUCTION -- HYBRID ESCAPE & HYBRID MARINER article to continue diagnosis of the electric coolant pump.

    No:  GO to  D2.

  2. D2 CHECK FOR CORRECT ENGINE COOLANT LEVEL 
    • Key in OFF position.
    • Check the engine coolant level at hot and cold temperatures.
    • Is the engine coolant at the correct level (hot/cold) in the radiator coolant recovery reservoir? 

    Yes:  GO to  D4.

    No:  GO to  D3.

  3. D3 CHECK THE COOLANT SYSTEM INCLUDING THE RADIATOR CAP FOR LEAKS 
    • Fill the engine cooling system to the specified level.
    • Pressure check the engine cooling system. Refer to ENGINE COOLING - HYBRID . It is not necessary to check components separately at this time.
    • Does the engine cooling system, including the radiator cap, hold pressure? 

    Yes:  The system is operating normally at this time. The concern may have been caused by a low coolant level.

    No:  REPAIR the engine cooling system. REFER to ENGINE COOLING - HYBRID . TEST the system for normal operation.

  4. D4 CHECK FOR HOT WATER TO THE HEATER CORE INLET HOSE 
    WARNING: The heater core hoses become too hot to handle and may cause serious burns if the system is working correctly.
    • Set the climate control to the warmest setting and the fan speed to the highest setting.
    • Start the engine and allow the engine to reach normal operating temperature.
    • Feel the heater core inlet hose.
      Fig 1: Checking For Hot Water To Heater Core Inlet Hose
      G04621525Courtesy of FORD MOTOR CO.
    • Is the heater core inlet hose too hot to handle? 

    Yes:  GO to  D5.

    No:  REFER to ENGINE COOLING - HYBRID to continue diagnosis of the engine cooling system.

  5. D5 CHECK THE HEATER CORE OUTLET HOSE FOR HOT WATER 
    • Feel the heater core outlet hose.
      Fig 2: Checking Heater Core Outlet Hose For Hot Water
      G04621526Courtesy of FORD MOTOR CO.
    • Is the heater core outlet hose warm/hot? 

    Yes:  REFER to ENGINE COOLING - HYBRID .

    No:  INSTALL a new heater core. REFER to REMOVAL AND INSTALLATION . TEST the system for normal operation.

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