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 System Description
In the automatic air conditioning system (auto A/C), HVAC control module automatically controls inside air temperature of the driver side and the passenger side, blower speed, air inlet and outlet, etc. Once users set desired inside air temperature with the temperature control selector and push "AUTO" switch, HVAC control module starts detecting the inside air temperature, the outside air temperature, sunlight of the driver side and the passenger side and the engine coolant temperature by means of the inside air temperature sensor, the outside air temperature sensor, the sunload sensor (driver side and passenger side detecting type), and the engine coolant temperature (ECT) sensor, respectively. When "DUAL" switch is at ON, the temperature of each driver side and passenger side can be selected, respectively. However, when "DUAL" switch is at OFF, selected temperature in the driver side is applied to the passenger side as well.
In this way, HVAC control module keeps in-car temperature at the desired level at all times.
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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.