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Home >> Lincoln >> 2009 >> MKX FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1115 (Climate Control System - General Information And Diagnostics) >> Diagnostic Tests >> Climate Control System >> Pinpoint Tests >> Pinpoint Test I: Insufficient, Erratic or No Heat >> Pinpoint Test I: Insufficient, Erratic Or No Heat

Pinpoint Test I: Insufficient, Erratic Or No Heat

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  1. I1 CHECK FOR CORRECT ENGINE COOLANT LEVEL 
    • 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  I3.
    2. 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? 
    1. YES  : REPAIR the engine coolant leak. TEST the system for normal operation.
    2. 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.
      • Fig 1: Checking Coolant Flow To Heater Core
      GF0001297Courtesy of FORD MOTOR CO.
    • Feel the heater core inlet hose to see if it is hot.
    • Is the heater core inlet hose hot? 
    1. YES  : Go to  I4.
    2. NO  : REFER to ENGINE COOLING to check cooling system function.
  4. I4 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.
      Fig 2: Check Plugged Or Restricted Heater Core
      GF0001298Courtesy of FORD MOTOR CO.
    • Feel the heater core outlet hose to see if it is hot.
    • Is the heater core outlet hose hot? 
    1. YES  : Go to Pinpoint Test F  and diagnose for a blend door actuator.
    2. NO  : INSTALL a new heater core. TEST the system for normal operation.
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