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Home >> Ford >> 2021 >> Expedition Platinum, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 198 (Climate Control System - General Information (2 Of 2)) >> Diagnosis And Testing >> Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) >> Pinpoint Test(s) >> Pinpoint Test F : Insufficient, Erratic Or No Heat >> Pinpoint Test F : Insufficient, Erratic Or No Heat

Pinpoint Test F : Insufficient, Erratic Or No Heat

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

  1. F1 CHECK FOR CORRECT ENGINE COOLANT LEVEL

    • Ignition OFF.

    • Check the engine coolant level.

    Is the engine coolant at the correct level as indicated on the engine coolant recovery reservoir? 

    Yes  GO to  F3
    No  GO to  F2

  2. F2 CHECK THE ENGINE COOLING SYSTEM FOR LEAKS

    • Pressure test the cooling system for leaks. Refer to the appropriate Engine Cooling System article for the procedure.

    Does the engine cooling system leak? 

    Yes  REPAIR the engine coolant leak. Refer to the appropriate Engine Cooling System article for the procedure. TEST the system for normal operation.
    No  FILL and BLEED the cooling system. Refer to the appropriate Engine Cooling System article for the procedure. After filling and bleeding the cooling system, GO to  F3

  3. F3 CHECK FOR COOLANT FLOW TO THE HEATER CORE

    • Run the motor until it reaches normal operating temperature. Select the floor position on the control assembly. Set the temperature control to full warm and the blower to the lowest setting.

    • Increase engine speed to 3, 500 RPM and hold for 30 seconds.

    • Allow the engine to idle for 30 seconds.

    • Using a suitable temperature measuring device, check the heater core inlet hose to see if it is hot.

    Is the heater core inlet hose hot? 

    Yes  GO to  F4
    No  BLEED the cooling system per the cooling system draining and vacuum filling general procedure. Refer to the appropriate Engine Cooling System article the procedure. After bleeding the cooling system, GO to  F4

  4. F4 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE

    • Using a suitable temperature measuring device, measure the heater core outlet hose temperature.

    Is the heater core outlet hose temperature similar to the inlet hose temperature (within approximately 6-17 deg. C [10-30 deg. F])? 

    Yes  DIAGNOSE for a temperature door actuator not operating correctly. For inadequate temperature, GO to Pinpoint Test I 
    No  INSTALL a new heater core. REFER to: Heater Core .
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