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Home >> Ford >> 2020 >> Fusion Titanium Hybrid >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 43 (Climate Control System - General Information (2 Of 2) (Except Hybrid)) >> Diagnosis And Testing >> Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) >> Pinpoint Tests >> Pinpoint Test F : Insufficient, Erratic Or No Heat

Pinpoint Test F : Insufficient, Erratic Or No Heat

WARNING: This page is about a different variant/trim than selected.
  1. Normal Operation and Fault Conditions 

    When the engine is at operating temperature hot coolant flows from the engine through the heater core and back to the engine. Correct coolant temperatures are critical for good heater performance.

    Possible Sources 

    • Low engine coolant level
    • Plugged or partially plugged heater core
    • Temperature door binding or stuck
    • Temperature door actuator

    Visual Inspection and Pre-checks 

    • Inspect for low engine coolant level.

  2. 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

  3. F2 CHECK THE ENGINE COOLING SYSTEM FOR LEAKS

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

    Does the engine cooling system leak? 

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

  4. F3 CHECK FOR COOLANT FLOW TO THE HEATER CORE

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

    • Using a suitable temperature measuring device, check the heater core inlet hose.

    Is the heater core inlet hose temperature above 65.5 °C (150 °F)? 

    Yes  GO to  F4
    No  DIAGNOSE the engine does not reach normal operating temperature. Refer to the appropriate Engine Cooling article .

  5. 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 °C [10-30 °F])? 

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