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Home >> Ford >> 2021 >> Mustang Mach 1, Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling - 5.0L 32V Ti-VCT (359KW/486PS) (WU)/5.0L Ti-VCT V8 (343KW/466PS) (MF) >> Diagnosis And Testing >> Engine Cooling >> Pinpoint Tests >> Pinpoint Test B: Pinpoint Test >> Pinpoint Test B: Pinpoint Test

Pinpoint Test B: Pinpoint Test

  1. B1 CARRY OUT INSPECTION AND VERIFICATION

    Are any concerns present? 

    Yes  REPAIR as needed.
    No  GO to  B2

  2. B2 CHECK FOR PCM (POWERTRAIN CONTROL MODULE) DTCS

    • Ignition ON.

    • Using a scan tool, perform PCM self-test.

    Is DTC P0217 and/or P1299 present? 

    Yes  GO to  B4
    No  Actual engine overheating has not been verified. CHECK the engine coolant temperature gauge operation. REFER to: Instrumentation, Message Center and Warning Chimes . If any other PCM DTCs are retrieved, REFER to: appropriate Electronic Engine Controls article .
     

  3. B3 CHECK FOR ACTIVE GRILL SHUDDER DTCS

    • Review the PCM DTCs.

    Are any active grill shudder DTCs present? 

    Yes  REFER to: Active Grille Shutter
    No  GO to  B4

  4. B4 CHECK FOR AN AIRFLOW OBSTRUCTION AND MISSING AIR DEFLECTORS

    NOTE: Verify no vehicle front end damage is present.

    • Check the radiator or A/C condenser for an external obstruction such as leaves or cardboard and verify all air deflectors are present.

    Is an airflow obstruction present or air deflectors missing? 

    Yes  REPAIR as necessary.
    No  GO to  B5

  5. B5 CHECK THE ENGINE COOLANT LEVEL AND PRESSURE TEST THE COOLING SYSTEM

    • Ignition OFF.

    • Visually check the engine coolant level in the coolant expansion tank and adjust as necessary. Pressure test the cooling system.

    Does the engine cooling system leak externally? 

    Yes  REPAIR or INSTALL new components.
    No  GO to  B6

  6. B6 CHECK THE ENGINE COOLANT FOR AN INTERNAL LEAK

    • Inspect the engine coolant in the coolant expansion tank for signs of engine oil.

    Is engine oil evident in the coolant? 

    Yes  REFER to: Engine
    No  GO to  B7

  7. B7 CHECK THE ENGINE OIL FOR COOLANT

    • Remove the oil level indicator from the engine.

    Is coolant evident in the oil? 

    Yes  REFER to: Engine
    No  GO to  B8

  8. B8 CHECK THE COOLING SYSTEM FOR COMBUSTION GASES

    NOTE: Use UView® Combustion Leak Tester part number UVU560000-R or equivalent.

    • Using a cooling system combustion gas leak tester, following the instructions supplied with the tester, check the coolant for combustion gases.

    Are combustion gases present? 

    Yes  REFER to: Engine
    No  GO to  B9

  9. B9 CHECK COOLANT CONDITION

    • Check the coolant for dirt, rust or contamination and check the coolant concentration.

    Is the coolant condition OK? 

    Yes  GO to  B10
    No  FLUSH the engine cooling system. REFER to: Engine Cooling System Flushing 

  10. B10 CHECK THE ELECTRIC COOLING FAN OPERATION

    • Start the engine.

    • Place the climate control function selector in the MAX A/C position and the blower motor switch in the HI position.

    Did the electric cooling fan operate? 

    Yes  GO to  B11
    No  DIAGNOSE the electric cooling fan operation. Refer to ENGINE CONTROLS - SYMPTOM CHARTS (EXCEPT DIESEL & HYBRID) .

  11. B11 CHECK THE COOLANT PUMP OPERATION

    • Start the engine.

    • Allow the engine to run for 30 minutes. Place the climate control function selector in the MAX HEAT position. Feel the heater outlet hose.

    Is the heater outlet hose hot? 

    Yes  GO to  B12
    No  INSTALL a new coolant pump. REFER to: Coolant Pump 

  12. B12 CHECK THE THERMOSTAT OPERATION

    NOTE: This cooling system uses a cold side thermostat. The coolant in the radiator must reach full operating temperature for the thermostat to remain in an open state.

    • Start the engine.

    • Allow the engine to run for 30 minutes. Place the climate control function selector in the MAX HEAT position. Feel the lower radiator hose.

    Is the lower radiator hose hot? 

    Yes  CHECK the temperature gauge operation. REFER to: Instrumentation, Message Center and Warning Chimes
    No  GO to  B13

  13. B13 VISUALLY INSPECT THE THERMOSTAT

    Is the thermostat damaged? 

    Yes  INSTALL a new thermostat. REFER to: Thermostat 
    No  INSTALL a new thermostat. REFER to: Thermostat . If the engine still overheats, INSTALL a new radiator. REFER to: Radiator 
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