Pinpoint Test K: HVAC Functions Verification
Climate Control System
Pinpoint Tests
Pinpoint Test K: HVAC Functions Verification
This pinpoint test is intended to diagnose the following:
- HVAC system
PINPOINT TEST K: 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. Diagnostic Trouble Code Tests and Associated Procedures
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K1 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 K2.
No
Electronic Manual Temperature Control (EMTC) systems, If the blower motor does not operate in any setting, Go To Pinpoint Test R. Pinpoint Test R: The Blower Motor Is Inoperative - EMTC
Electronic Automatic Temperature Control (EATC) /Dual Automatic Temperature Control (DATC) systems, If the blower motor does not operate in any setting, Go To Pinpoint Test T. Pinpoint Test T: The Blower Motor Is Inoperative - DATC/EATC
EMTC systems, 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 - EMTC
EATC /DATC systems, If the blower motor does not properly change speeds or shut OFF, Go To Pinpoint Test U. Pinpoint Test U: The Blower Motor Does Not Operate Correctly - DATC/EATC
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K2 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 K3.
No
Go To Pinpoint Test I. Pinpoint Test I: Incorrect/Erratic Direction of Airflow From Outlet(s)
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K3 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 K4.
No
If the temperature does not get very warm, Go To Pinpoint Test L. Pinpoint Test L: Insufficient, Erratic or No Heat
EMTC systems, If the temperature does not change at all, Go To Pinpoint Test P. Pinpoint Test P: Temperature Control Is Inoperative/Does Not Operate Correctly - EMTC
EATC /DATC systems, If the temperature does not change at all, Go To Pinpoint Test Q. Pinpoint Test Q: Temperature Control Is Inoperative/Does Not Operate Correctly - EATC/DATC
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K4 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 K5.
No
EMTC systems, If the temperature is warmer than ambient temperature, Go To Pinpoint Test P and diagnose for inoperative blend door. Pinpoint Test P: Temperature Control Is Inoperative/Does Not Operate Correctly - EMTC
EATC /DATC systems, If the temperature is warmer than ambient temperature, Go To Pinpoint Test Q and diagnose for inoperative blend door. Pinpoint Test Q: Temperature Control Is Inoperative/Does Not Operate Correctly - EATC/DATC
If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch cycles normally, Go To Pinpoint Test O. Pinpoint Test O: The Air Conditioning (A/C) Is Always On - A/C Mode Always Commanded ON
If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch does not cycle, Go To Pinpoint Test N. Pinpoint Test N: The Air Conditioning (A/C) Is Always on - A/C Compressor Does Not Cycle
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K5 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?
Yes
GO to K6.
No
Go To Pinpoint Test M. Pinpoint Test M: The Air Conditioning (A/C) Is Inoperative
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K6 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
The system is operating normally.
No
Go To Pinpoint Test H. Pinpoint Test H: Air Inlet Door Is Inoperative
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