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.
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?
Yes
- The repair is not complete. Refer to the related category for the DTC or symptom that is still present.
No
- 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:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.