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Pinpoint Test H: HVAC Functions Verification

NOTE: Diagnose any HVAC module DTCs before carrying out the following pinpoint test.
NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to PCM DTC CHART .
  1. H1 CHECK THE BLOWER MOTOR OPERATION 
    • Ignition ON.
    • Select PANEL mode.
    • Observe blower motor operation and select each blower motor speed.
    • Does the blower motor operate in all selections and change speed in each? 
    • Yes  : GO to H2.
    • No  : If the blower motor does not operate in any setting, Go To PINPOINT TEST P .

      If the blower motor does not properly change speeds or shut OFF, Go To PINPOINT TEST Q .

  2. H2 CHECK AIRFLOW OPERATION 
    • Select the highest blower motor setting.
      • NOTE: Refer to DESCRIPTION AND OPERATION  for proper airflow descriptions.
    • While observing the airflow, select each of the airflow positions (PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST, DEFROST).
    • Is the airflow directed to the proper outlets? 
  3. H3 VERIFY TEMPERATURE CONTROL OPERATION 
    • Start the vehicle and allow it to reach normal operating temperature.
    • With the A/C OFF, select PANEL mode.
    • Change the temperature setting from the coldest to the warmest and back to the coldest.
    • Does the temperature change between very warm to cool? 
    • Yes  : GO to H4.
    • No  : If the temperature does not get very warm, Go To PINPOINT TEST K .

      If the temperature does not change at all, Go To PINPOINT TEST O .

  4. H4 VERIFY THE A/C CLUTCH DOES NOT ENGAGE WITH A/C OFF 
    • With the A/C OFF, select PANEL mode.
    • Select the coldest temperature setting.
    • Is the outlet temperature close to ambient temperature? 
    • Yes  : GO to H5.
    • No  : If the temperature is warmer than ambient temperature, Go To PINPOINT TEST O  and diagnose for inoperative blend door.

      If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch cycles normally, Go To PINPOINT TEST N .

      If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch does not cycle, Go To PINPOINT TEST M .

  5. H5 VERIFY A/C CLUTCH ENGAGEMENT IN THE A/C MODE 
    • Make sure the ambient air temperature is above 2°C (35°F).
    • Select PANEL mode.
    • Press the A/C button (indicator ON).
    • Does the A/C clutch engage when the PANEL and A/C button (indicator ON) is pressed? 
  6. H6 CHECK THE RECIRC OPERATION 
    • Press the RECIRC button (indicator OFF).
    • Select PANEL mode.
    • Select the highest blower motor setting.
    • Observe airflow noise.
    • Press the RECIRC button (indicator ON).
    • Does the airflow noise increase when the RECIRC mode is selected (indicator ON)? 
  7. H7 CHECK THE AUXILIARY BLOWER MOTOR OPERATION 
    • Using the front and rear auxiliary blower motor controls, observe blower motor operation and select each auxiliary blower motor speed.
    • Does the auxiliary blower motor operate in all selections and change speed in each? 
    • Yes  : GO to H8.
    • No  : If the auxiliary blower motor does not operate in any setting, Go To PINPOINT TEST R .

      If the auxiliary blower motor does not properly change speeds or shut OFF using both the front and rear auxiliary controls, Go To PINPOINT TEST S .

      If the auxiliary blower motor does not properly change speeds or shut OFF using the rear auxiliary controls only, Go To PINPOINT TEST V .

  8. H8 VERIFY AUXILIARY TEMPERATURE/MODE OPERATION 
    • Select the highest auxiliary blower motor setting.
    • Using the front and rear auxiliary controls, change the temperature/mode setting from the coldest to the warmest/floor and back to the coldest/overhead.
    • Does the temperature change between very warm to cool and auxiliary airflow to the floor when warm is selected and headliner when cool is selected? 
    • Yes  : The system is operating normally.
    • No  : If the auxiliary temperature control is inoperative/does not operate correctly from the front/rear auxiliary controls, Go To PINPOINT TEST T .

      If the auxiliary temperature control is inoperative/does not operate correctly from the front auxiliary controls only, CARRY OUT the HVAC Module Cold Boot Process. If the condition returns, INSTALL a new HVAC module. REFER To CLIMATE CONTROL . TEST the system for normal operation.

      If the auxiliary panel/floor control is inoperative/does not operate correctly from the front/rear auxiliary controls, Go To PINPOINT TEST U .

      If the auxiliary panel/floor control is inoperative/does not operate correctly from the front auxiliary controls only, CARRY OUT the HVAC MODULE COLD BOOT PROCESS . If the condition returns, INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.

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