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Pinpoint Test I: Insufficient, Erratic Or No Heat

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. I1 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? 
    • Yes  : GO to  I3.
    • No  : GO to I2.
  2. I2 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 I3.
  3. I3 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.
    • 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? 
    • Yes  : GO to  I7.
    • No  : GO to I4.
  4. I4 CHECK FOR COOLANT FLOW TO THE HEATER CONTROL VALVE 
    WARNING: The heater control valve inlet hose will become too hot to handle and may cause serious burns if the system is working correctly.
    • Feel the heater control valve inlet hose to see if it is hot.
      Fig 2: Checking For Coolant Flow To Heater Control Valve
      G03910131Courtesy of FORD MOTOR CO.
    • Is the heater control valve inlet hose hot? 
  5. I5 CHECK FOR VACUUM AT THE HEATER CONTROL VALVE 
    NOTE: Vacuum should not be present in FLOOR and Full WARM. Vacuum should only be present in MAX A/C.
    • Disconnect the heater control valve vacuum connector and check for vacuum.
      Fig 3: Locating Heater Control Valve Vacuum Connector
      G03910132Courtesy of FORD MOTOR CO.
    • Is vacuum present at the heater control valve? 
    • Yes  : GO to I6.
    • No  : INSTALL a new heater control valve. TEST the system for normal operation.
  6. I6 CHECK FOR INCORRECT VACUUM LINE PLACEMENT 
    • Key in OFF position.
    • Inspect the heater control valve and A/C vacuum lines for correct placement.
    • Is the vacuum line placement correct? 
    • Yes  : Vehicles with manual climate control, INSTALL a new climate control assembly. REFER to CONTROL COMPONENTS . TEST the system for normal operation.

      Vehicles with EATC, GO to  I8.

    • No  : CORRECT the vacuum line placement. TEST the system for normal operation.
  7. I7 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 4: Locating Heater Core Outlet Hose
      G03910133Courtesy of FORD MOTOR CO.
    • Is the heater core outlet hose hot? 
  8. I8 CHECK THE CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: DATC/EATC Module C228a.
    • Disconnect: RSA Module C2093.
    • Measure the resistance between the DATC/EATC module C228a-11, circuit 1111 (VT) and the RSA module C2093-6, circuit 1111 (VT).
      Fig 5: Checking Circuit For Open
      G03910134Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new RSA module. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
    • No  : REPAIR circuit 1111 (VT) for an open. TEST the system for normal operation.
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