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Pinpoint Test H : Insufficient, Erratic Or No Heat

  1. H1 CHECK FOR CORRECT ENGINE COOLANT LEVEL

    • Ignition OFF.

    • Check the engine coolant level when hot and cold.

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

    Yes  GO to  H3
    No  GO to  H2

  2. H2 CHECK THE ENGINE COOLING SYSTEM FOR LEAKS

    • Pressure test the cooling system for leaks, refer to Component Tests: Cooling System Pressure Test. Refer to: Engine Cooling .

    Does the cooling system leak? 

    Yes  REPAIR the coolant leak.
    No  FILL and BLEED the cooling system. Refer to: Cooling System Draining, Filling and Bleeding . After filling and bleeding the cooling system, GO to  H3

  3. H3 CHECK FOR COOLANT FLOW TO THE HEATER CORE

    • Run the engine until it reaches normal operating temperature.

    • On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.

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

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

    Yes  GO to  H4
    No  CHECK the cooling system function. Refer to: Engine Cooling .

  4. H4 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE

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

    Is the heater core outlet hose temperature similar to the inlet hose temperature, within approximately 6-17 °C (10-30 °F)? 

    Yes  DIAGNOSE an inoperative temperature door actuator, GO to Pinpoint Test K 
    No  INSTALL a new heater core. Refer to: Heater Core - LHD FWD .
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