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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 106 (HVAC Climate Control System - General Information & Diagnostics) >> Diagnostic Tests >> Climate Control System >> Pinpoint Tests >> Pinpoint Test H: Insufficient, Erratic or No Heat >> Pinpoint Test H: Insufficient, Erratic Or No Heat

Pinpoint Test H: Insufficient, Erratic Or No Heat

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. 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 when cold.
    • Is the engine coolant at correct level (hot and cold) as indicated on the engine coolant recovery reservoir? 
    1. YES  : Go to  H3.
    2. NO  : Go to  H2.
  2. H2 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 article. It is not necessary to check the components separately at this time.
    • Does the engine cooling system, including the radiator cap, hold pressure? 
    1. YES  : Go to  H3.
    2. NO  : REPAIR the engine coolant leak. REFER to ENGINE COOLING article. TEST the system for normal information.
  3. H3 CHECK FOR COOLANT FLOW TO THE HEATER CORE 
    • Run the engine until it reaches normal operation temperature. Select the FLOOR position on the control assembly. Set the temperature control to full warm and the blower to the lowest setting.
      • Fig 1: Heater Core Inlet Hose
      GF0014323Courtesy of FORD MOTOR CO.
    • Using a suitable thermo-couple temperature measuring device, check the heater core inlet hose to see if it is hot.
    • Is the heater core inlet hose hot? 
    1. YES  : Go to  H4.
    2. NO  : REFER to ENGINE COOLING article to check cooling system function.
  4. H4 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE 
      Fig 2: Heater Core Outlet Hose
      GF0014324Courtesy of FORD MOTOR CO.
    • Using a suitable thermo-couple temperature measuring device, measure the heater core outlet hose temperature.
    • Is the heater core outlet hose temperature similar to the inlet hose temperature (6-17°C [10-30°F])? 
    1. YES  : CARRY OUT the Heater Core Component Test. REFER to Heater Core  to determine whether a plugged or partial plugged condition exists.
    2. NO  : Vehicles with manual climate control, go to Pinpoint Test K .

      Vehicles with EATC, go to Pinpoint Test A .

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