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PINPOINT TEST G: Climate Control System Functional Test

  1. G1 PERFORM A SELF-TEST ON THE PCM AND HVAC MODULE 
    • Ignition ON.
    • Using a scan tool, perform PCM  and HVAC  module self-tests.

    Are any climate control related DTCs present? 

    1. Yes  : For HVAC  module DTCs  , Refer to CLIMATE CONTROL SYSTEM .

      For PCM DTCs  , REFER to ELECTRONIC ENGINE CONTROLS .

    2. No  : GO to G2  .
  2. G2 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? 

    1. Yes  : GO to G3  .
    2. No  : If the blower motor does not operate in any setting, GO to PINPOINT TEST O .

      If the blower motor does not properly change speeds or shut off, GO to PINPOINT TEST P .

  3. G3 CHECK AIRFLOW OPERATION 
    • Select the highest blower motor setting.
    • While observing the airflow, select each of the airflow positions (panel, panel/floor, floor, floor/defrost, defrost).

    Is the airflow directed to the correct outlets? 

    1. Yes  : GO to G4  .
    2. No  : GO to PINPOINT TEST I .
  4. G4 CHECK THE RECIRCULATION OPERATION 
    • With the engine running, press the recirculation button (indicator off).
    • Select panel mode.
    • Select the highest blower motor setting.
    • Observe airflow noise.
    • Press the recirculation button (indicator on).

    Does the airflow noise increase when the recirculation mode is selected (indicator on)? 

    1. Yes  : GO to G5  .
    2. No  : GO to PINPOINT TEST H .
  5. G5 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? 

    1. Yes  : GO to G6  .
    2. No  : If the temperature does not get significantly warmer, GO to PINPOINT TEST J .

      If the temperature does not change significantly, GO to PINPOINT TEST N .

  6. G6 VERIFY THE A/C CLUTCH DOES NOT ENGAGE WITH A/C OFF 
    • With the engine running and the A/C off, select panel mode.
    • Select the coldest temperature setting.

    Is the outlet temperature close to ambient temperature? 

    1. Yes  : GO to G7  .
    2. No  : If the temperature is warmer than ambient temperature, GO to PINPOINT TEST N .

      If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch cycles normally, GO to PINPOINT TEST M .

      If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch is engaged and does not cycle, GO to PINPOINT TEST L .

  7. G7 VERIFY A/C CLUTCH ENGAGEMENT IN THE A/C MODE 
    • Make sure the ambient air temperature is above 2°C (36°F).
    • With the engine running, 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? 

    1. Yes  : GO to G8  .
    2. No  : GO to PINPOINT TEST K .
  8. G8 CHECK FOR INSUFFICIENT COOLING 
    • Change the temperature setting to coldest (MAX A/C).
    • Press the A/C button if the indicator is not on.

    Does the A/C compressor clutch engage and cycle on/off when the A/C indicator is on? 

    1. Yes  : The system is operating correctly.
    2. No  : Refer to REFRIGERANT SYSTEM TESTS .
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