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 Control Module
The HVAC control module is on the MS-CAN and does set Diagnostic trouble Codes (DTCs).
The temperature control switch adjusts the discharge air temperature. Movement of the temperature knob from cool to warm causes the temperature door to move. The position of the temperature door determines the discharge air temperature. The temperature control selector is an integral part of the HVAC control module and cannot be serviced separately.
The airflow mode setting adjusts the discharge air outlet location. Each airflow mode selector icon causes a corresponding movement of the airflow mode doors and determines the discharge air outlet location. The airflow mode selector knob is an integral part of the HVAC control module and cannot be serviced separately.
The A/C button determines A/C compressor operation, except when the temperature selector is set to MAX A/C or the airflow mode selector is in defrost mode. The A/C button is an integral part of the HVAC control module and cannot be serviced separately.
The recirculated air request button can be activated in any mode except defrost and MAX A/C. The recirculated air request button is an integral part of the HVAC control module and cannot be serviced separately.
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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.