Pinpoint Test K: Unable To Duplicate Customer Concern and No DTCs Present
Climate Control System
Pinpoint Test K: Unable to Duplicate Customer Concern and No DTCs Present
This pinpoint test is intended to diagnose the following:
- Incorrect functioning of the HVAC system
PINPOINT TEST K : UNABLE TO DUPLICATE CUSTOMER CONCERN AND NO DTCs PRESENT
NOTE: Diagnose any PCM, HVAC module or Air Conditioning Compressor Module (ACCM) DTCs before carrying out the following pinpoint test.
K1 HVAC MODULE AND A/C COMPRESSOR SELF-TEST
NOTE: If sent to this pinpoint test from the HVAC Module and A/C Compressor Self-Test, GO to step K2.
- Carry out the HVAC Module and A/C Compressor Self-Test.
Were all modes in the self-test achieved?
Yes
GO to K2.
No
Follow the actions within the HVAC Module and A/C Compressor Self-Test.
K2 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 K3.
No
If the blower motor does not operate in any setting, GO to Pinpoint Test R. Pinpoint Test R: The Blower Motor is Inoperative
If the blower motor does not properly change speeds or shut OFF, GO to Pinpoint Test S. Pinpoint Test S: The Blower Motor Does Not Operate Correctly
K3 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?
Yes
GO to K4.
No
GO to Pinpoint Test M. Pinpoint Test M: Incorrect/Erratic Direction Of Airflow From Outlets
K4 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 K5.
No
If the temperature does not get very warm or heat is erratic, GO to Pinpoint Test N. Pinpoint Test N: Insufficient, Erratic Or No Heat
If the temperature does not change at all, GO to Pinpoint Test Q and DIAGNOSE for temperature control is inoperative/does not operate correctly. Pinpoint Test Q: Temperature Control is Inoperative/Does Not Operate Correctly
K5 VERIFY NO A/C COMPRESSOR OPERATION 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 K6.
No
If the temperature is warmer than ambient temperature, GO to Pinpoint Test Q and DIAGNOSE for temperature control is inoperative/does not operate correctly. Pinpoint Test Q: Temperature Control is Inoperative/Does Not Operate Correctly
If the outlet temperature is significantly colder than ambient temperature, GO to Pinpoint Test P. Pinpoint Test P: The Air Conditioning (A/C) is Always On
K6 VERIFY A/C OPERATION 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 operate when the PANEL and A/C button (indicator ON) is pressed?
Yes
GO to K7.
No
GO to Pinpoint Test O. Pinpoint Test O: The Air Conditioning (A/C) is Inoperative
K7 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)?
Yes
GO to K8.
No
GO to Pinpoint Test L. Pinpoint Test L: The Air Inlet Door is Inoperative
K8 CHECK AUXILIARY COOLANT FLOW PUMP OPERATION
- Allow the vehicle to cool to ambient temperature.
- 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 highest blower motor setting.
Does the discharge air temperature closely maintain its warm temperature for an extended period of time?
Yes
The system is operating normally.
No
GO to Pinpoint Test N. Pinpoint Test N: Insufficient, Erratic Or No Heat