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Pinpoint Test H: Insufficient, Erratic Or No Heat

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. H1 CHECK FOR CORRECT ENGINE COOLANT LEVEL 
    • Key in OFF position.
    • 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? 
    1. Yes  : GO to  H3.
    2. No  : GO to H2.
  2. H2 CHECK THE ENGINE COOLING SYSTEM FOR LEAKS 
    • Pressure test the cooling system for leaks. Refer to ENGINE COOLING .
    • Does the engine cooling system leak? 
    1. Yes  : REPAIR the engine coolant leak. TEST the system for normal operation.
    2. No  : GO to H3.
  3. H3 CHECK FOR COOLANT FLOW TO THE HEATER CORE 
    WARNING: The heater core inlet hose will become too hot to handle and may cause serious burns if the system is working correctly.
    • Key in ON position.
    • Run the engine until it reaches normal operation temperature. Select the FLOOR position on the control assembly. Set the temperature control to full WARM.
    • Feel the heater core inlet hose to see if it is hot.
      Fig 1: Identifying Heater Core Inlet Hose
      G03910130Courtesy of FORD MOTOR CO.
    • Is the heater core inlet hose hot? 
    1. Yes  : GO to  H4.
    2. No  : REFER to ENGINE COOLING to check cooling system function.
  4. H4 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE 
    WARNING: The heater core outlet hose will become too hot to handle and may cause serious burns if the system is operating correctly.
    • Feel the heater core outlet hose to see if it is hot.
      Fig 2: Locating Heater Core Outlet Hose
      G03910133Courtesy of FORD MOTOR CO.
    • Is the heater core outlet hose hot? 
    1. Yes  : GO to PINPOINT TEST D  and diagnose for a blend door actuator.
    2. No  : INSTALL a new heater core (18476). REFER to HEATING & VENTILATION . TEST the system for normal operation.
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