Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
HVAC Verification Test
Perform the following procedures to verify that the repair(s) are valid:
- Make sure that all accessories are turned off.
- Make sure that the battery is fully charged.
- Turn the ignition off to the lock position.
- Disconnect all jumper wires and reconnect all previously disconnected components and connectors.
- With the scan tool, record and erase all Diagnostic Trouble Codes (DTCs) from ALL modules.
- Turn the ignition off, remove the scan tool from the DLC (Data Link Connector). Open the door and close the door. Wait a minimum 30 seconds, then turn the ignition on. Reconnect the scan tool.NOTE:
Disconnecting the scan tool and opening and closing the door will allow the controller to enter into sleep mode.
- With the scan tool perform the HVAC Actuator Calibration Test.
- Start and run the engine for two minutes while operating all functions of the system that caused the original concern.
- With the scan tool, check for DTCs in all modules.
Is the original condition still present or are there any other HVAC DTCs present?Β
YesΒ
- Refer to DIAGNOSIS AND TESTINGΒ and perform the appropriate diagnostic procedure.
NoΒ
- Repair is complete.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.