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Home >> Ford >> 2018 >> Taurus Limited, FWD, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 32 (Climate Control System - General Information (2 Of 2)) >> Diagnosis And Testing >> Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) >> Pinpoint Tests >> Pinpoint Test G : Insufficient, Erratic Or No Heat

Pinpoint Test G : Insufficient, Erratic Or No Heat

WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.
  1. Automatic Climate Control System for schematic and connector information.

    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 binding or stuck
    • Temperature door actuator

    Visual Inspection and Pre-checks 

    • Inspect for low engine coolant level.

  2. G1 CHECK FOR CORRECT ENGINE COOLANT LEVEL

    • Ignition OFF.

    • Check the engine coolant level.

    Is the engine coolant at the correct level (hot/cold) as indicated on the engine coolant recovery reservoir? 

    Yes  GO to  G2
    No  DIAGNOSE the loss of coolant. Refer to the appropriate procedure in ENGINE COOLING (1.0L) or ENGINE COOLING (2.0L)

  3. G2 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.

    • 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  G3
    No  DIAGNOSE the engine does not reach normal operating temperature. Refer to the appropriate procedure in ENGINE COOLING (1.0L) or ENGINE COOLING (2.0L)

  4. G3 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. GO to Pinpoint Test J 
    No  INSTALL a new heater core. REFER to: Heater Core .
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