Pinpoint Test E : Unable To Duplicate The Customer Concern And No Diagnostic Trouble Codes (DTCS) Present

NOTE: Before carrying out the following test, diagnose all BCM, HVAC control module and PCM Diagnostic Trouble Codes (DTCs).

E1 CHECK THE BLOWER MOTOR OPERATION

Ignition ON.

On the HVAC controls, select PANEL mode.

Observe blower motor operation and select each blower motor speed.

Does the blower motor operate in all ranges?

Yes

GO to E2

If the front blower motor does not operate in any setting, GO to Pinpoint Test L . If the rear blower motor does not operate in any setting, GO to Pinpoint Test R . If the front blower motor does not correctly change speeds or turn off when the system is turned off, GO to Pinpoint Test M . If the rear blower motor does not correctly change speeds or turn off when the system is turned off, GO to Pinpoint Test S

E2 CHECK AIRFLOW OPERATION
- On the HVAC controls, 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?

Yes GO to E3

No If the front airflow is incorrect, GO to Pinpoint Test G . If the rear airflow is incorrect, GO to Pinpoint Test T

E3 VERIFY TEMPERATURE CONTROL OPERATION

Start the vehicle and allow it to reach normal operating temperature.

On the HVAC controls, select the A/C off (indicator off) and 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 E4

No	If the temperature does not get very warm, GO to Pinpoint Test H . If the temperature does not change at all, GO to Pinpoint Test K . If the rear electric booster heater is inoperative or does not operate correctly, GO to Pinpoint Test Q

E4 VERIFY THE A/C (AIR CONDITIONING) CLUTCH DOES NOT ENGAGE WITH THE A/C (AIR CONDITIONING) OFF

With the engine running, select the A/C off (indicator off) and select PANEL mode on the HVAC controls.

On the HVAC controls, select the coldest temperature setting.

Is the register vent outlet temperature close to ambient temperature?

Yes

GO to E5

No	If the temperature is warmer than ambient temperature DIAGNOSE the temperature door, GO to Pinpoint Test K . If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch cycles normally, GO to Pinpoint Test J

E5 VERIFY A/C (AIR CONDITIONING) CLUTCH ENGAGEMENT IN THE A/C (AIR CONDITIONING) MODE
- Make sure the ambient air temperature is above approximately 1 °C (33.8 °F).
- On the HVAC controls, select PANEL mode, then press the A/C button (indicator on).
Does the A/C clutch engage when the panel mode is selected and the A/C button (indicator on) is pressed?

Yes GO to E6

No GO to Pinpoint Test I

E6 CHECK THE RECIRCULATED AIR OPERATION
- With the engine running, press the RECIRC button (indicator off) on the HVAC controls.
- On the HVAC controls, select PANEL mode, then select the highest blower motor setting.
- Observe airflow noise.
- On the HVAC controls, press the RECIRC button (indicator on).
Does the airflow noise increase when the RECIRC mode is selected (indicator on)?

Yes The system is operating normally.

No GO to Pinpoint Test F