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Pinpoint Test J: Insufficient, Erratic Or No Heat

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. J1 CHECK FOR PROPER 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  J3.
    • No  : GO to J2.
  2. J2 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 J3.
  3. J3 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: Checking Coolant Flow To Heater Core
      G03945028Courtesy of FORD MOTOR CO.
    • Is the heater core inlet hose hot? 
    • Yes  : GO to  J9.
    • No  : GO to J4.
  4. J4 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 Coolant Flow To Heater Control Valve
      G03910131Courtesy of FORD MOTOR CO.
    • Is the heater control valve inlet hose hot? 
  5. J5 CHECK FOR VACUUM AT THE HEATER CONTROL VALVE 
    • 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 J6.
    • No  : INSTALL a new heater control valve. REFER to HEATING AND VENTILATION . TEST the system for normal operation.
  6. J6 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  : For manual climate control systems, INSTALL a new heater control valve vacuum switch.

      For DATC systems, GO to J7.

    • No  : CORRECT the vacuum line placement. TEST the system for normal operation.
  7. J7 CHECK THE CIRCUIT FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: ATC Solenoid and Manifold C2093.
    • Key in ON position.
    • Measure the voltage between the ATC solenoid and manifold C2093-6, circuit 1069 (OG/LB) and ground.
      Fig 4: Measuring Voltage Between ATC Solenoid And Manifold C2093-6, Circuit 1069 (OG/LB) And Ground
      G03945031Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    • Yes  : GO to J8.
    • No  : INSTALL a new ATC solenoid and manifold. TEST the system for normal operation.
  8. J8 CHECK THE CIRCUIT FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: DATC Module C228a.
    • Key in ON position.
    • Measure the voltage between the ATC solenoid and manifold C2093-6, circuit 1069 (OG/LB) and ground.
      Fig 5: Measuring Voltage Between ATC Solenoid And Manifold C2093-6, Circuit 1069 (OG/LB) And Ground
      G03945031Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    • Yes  : REPAIR circuit 1069 (OG/LB) for a short to voltage. TEST the system for normal operation.
    • No  : INSTALL a new DATC module. TEST the system for normal operation.
  9. J9 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 6: Checking Plugged Or Restricted Heater Core
      G03945033Courtesy of FORD MOTOR CO.
    • Is the heater core outlet hose hot? 
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