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Pinpoint Test B: Insufficient, Erratic, Or No Heat

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  1. B1 CHECK FOR CORRECT ENGINE COOLANT LEVEL 
    • Key in OFF position.
      • WARNING: Never remove the pressure relief cap while the engine is operating or when the cooling system is hot. Failure to follow these instructions can result in damage to the cooling system or engine or personal injury. To avoid having scalding hot coolant or steam blow out of the degas bottle when removing the pressure relief cap, wait until the engine has cooled, then wrap a thick cloth around the pressure relief cap and turn it slowly. Step back while the pressure is released from the cooling system. When you are sure all the pressure has been released, (still with a cloth) turn and remove the pressure relief cap.
    • Check the engine coolant level.
    • Is the engine coolant at the correct level? 
    • Yes  : GO to  B3.
    • No  : GO to B2.
  2. B2 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  : GO to B3.
  3. B3 CHECK FOR HOT COOLANT TO THE HEATER CORE INLET HOSE 
    • Key in ON position.
    • Start the engine.
    • Allow the engine to reach normal operating temperature.
      • WARNING: Do not stand in line with or near the fan blade when the engine is running.
      WARNING: The heater core inlet hose will become too hot to handle and can cause serious burns if the system is working correctly.
      Fig 1: Checking Hot Coolant To Heater Core Inlet Hose (Main System)
      G03889896Courtesy of FORD MOTOR CO.
      Fig 2: Checking Hot Coolant To Heater Core Inlet Hose (Auxiliary System)
      G03889897Courtesy of FORD MOTOR CO.
    • Lightly touch the heater core inlet hose.
    • Is the heater core inlet hose hot? 
  4. B4 CHECK THE HEATER CORE OUTLET HOSE FOR HOT COOLANT 
    • Key in ON position.
    • Start the engine.
    • Allow the engine to reach normal operating temperature.
      • WARNING: Do not stand in line with or near the fan blade when the engine is running.
      WARNING: The heater core outlet hose will become too hot to handle and can cause serious burns if the system is working correctly.
      Fig 3: Checking Heater Core Outlet Hose For Hot Coolant (Main System)
      G03889898Courtesy of FORD MOTOR CO.
      Fig 4: Checking Heater Core Outlet Hose For Hot Coolant (Auxiliary System)
      G03889899Courtesy of FORD MOTOR CO.
    • Lightly touch the heater core outlet hose.
    • Is the heater core outlet hose cool or cold? 
    • Yes  : TEST the heater core for a plugged or partial plugged condition.
    • No  : GO to PINPOINT TEST F .
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