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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1516 (Climate Control System - General Information & Diagnostics (Hybrid)) >> Diagnosis And Testing >> Climate Control System >> Pinpoint Tests >> Pinpoint Test H: Insufficient, Erratic Or No Heat >> Overview

Pinpoint Test H: Insufficient, Erratic Or No Heat: Overview

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  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/cold) as indicated on the engine coolant recovery reservoir? 
    1. Yes  : GO to  H3.
    2. No  : GO to H2.
  2. H2 CHECK THE ENGINE COOLING SYSTEM FOR LEAKS 
    1. Yes  : REPAIR the engine coolant leak. TEST the system for normal operation.
    2. No  : FILL and BLEED the cooling system. REFER to ENGINE COOLING SYSTEM (EXCEPT HYBRID) article. After filling and bleeding the cooling system, GO to H3.
  3. H3 CHECK FOR COOLANT FLOW TO THE HEATER CORE 
    • Start the engine and let the engine idle until it shuts down automatically,
    • Select FLOOR mode.
    • Set the temperature to the warmest setting.
    • Select the lowest blower motor setting.
    • Using a suitable temperature measuring device, check the heater core inlet hose to see if it is hot.
      Fig 1: Locating Heater Core Inlet Hose
      G06064571Courtesy of FORD MOTOR CO.
    • Is the heater core inlet hose hot? 
    1. Yes  : GO to H4.
    2. No  : GO to  H5.
  4. H4 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE 
    • Using a suitable temperature measuring device, measure the heater core outlet hose temperature.
      Fig 2: Locating Heater Core Outlet Hose
      G06064572Courtesy of FORD MOTOR CO.
    • Is the heater core outlet hose temperature similar to the inlet hose temperature (within approximately 6-17°C [10-30°F])? 
    1. Yes  : REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION & DIAGNOSTICS -- FUSION, MILAN & MKZ (EXCEPT HYBRID) article and diagnose for temperature control is inoperative/does not operate correctly.
    2. No  : INSTALL a new heater core. TEST the system for normal operation.
  5. H5 CHECK FOR COOLANT FLOW TO THE AUXILIARY COOLANT FLOW PUMP 
    • Using a suitable temperature measuring device, check the auxiliary coolant flow pump inlet hose to see if it is hot.
    • Is the auxiliary coolant flow pump inlet hose hot? 
    1. Yes  : GO to H6.
    2. No  : REFER to ENGINE COOLING SYSTEM -- (HYBRID) article to check cooling system function.
  6. H6 CHECK CIRCUIT CHC01 (BN/YE) FOR VOLTAGE 
    • Ignition OFF.
    • Disconnect: Auxiliary Coolant Flow Pump C1450.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: DataLogger - PCM.
    • Toggle the Heater Pump Commanded (HPUMP) output command ON.
    • Measure the voltage between auxiliary coolant flow pump C1450-2, circuit CHC01 (BN/YE), harness side and ground.
      Fig 3: Measuring Voltage Between Auxiliary Coolant Flow Pump C1450-2, Circuit CHC01 (BN/YE) And Ground
      G06262723Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to H7.
    2. No  : CARRY OUT the auxiliary coolant flow pump relay component test. Refer to ENGINE CONTROLS - COMPONENT TESTING -- FUSION HYBRID, MILAN HYBRID & MKZ HYBRID article for component testing. If the relay tests OK, GO to H8.
  7. H7 CHECK CIRCUIT GD121 (BK/YE) FOR GROUND 
    • Ignition OFF.
    • Measure the voltage between auxiliary coolant flow pump C1450-1, circuit GD121 (BK/YE), harness side and auxiliary coolant flow pump C1450-2, circuit CHC01 (BN/YE), harness side.
    1. Yes  : INSTALL a new auxiliary coolant flow pump. REFER to CLIMATE CONTROL -- FUSION, MILAN & MKZ article. TEST the system for normal operation.
    2. No  : REPAIR circuit GD121 (BK/YE) for an open. TEST the system for normal operation.
      Fig 4: Measuring Voltage Between Auxiliary Coolant Flow Pump C1450-1, Circuit GD121 (BK/YE) And C1450-2, Circuit CHC01 (BN/YE)
      G06262724Courtesy of FORD MOTOR CO.
    3. Is the voltage greater than 10 volts? 
  8. H8 CHECK THE AUXILIARY COOLANT FLOW PUMP RELAY VOLTAGE SUPPLY 
    • Ignition OFF.
    • Disconnect: Auxiliary Coolant Flow Pump Relay.
    • Ignition ON.
    • Measure the voltage between ground and auxiliary coolant flow pump relay socket, circuit SBB13 (GY/RD).
      Fig 5: Measuring Voltage Between Ground And Auxiliary Coolant Flow Pump Relay Socket, Circuit SBB13 (GY/RD)
      G06262725Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : REPAIR circuit CHC01 (BN/YE) for an open. TEST the system for normal operation.
    2. No  : VERIFY Battery Junction Box (BJB) fuse 13 (15A) is OK. If OK, REPAIR circuit SBB13 (GY/RD) for an open. TEST the system for normal operation. If not OK, REFER to the SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short.
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