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.
Manual Climate Control System
The manual climate control system heats or cools the vehicle interior depending on the position of the function selector switch and the temperature selected. The position of the function selector switch determines heating or cooling and air distribution. The temperature control setting determines air temperature.
The blower motor switch:
- sets the blower motor speed.
- directs the blower motor path to ground through the blower motor resistor to allow blower motor operation in LO, M2 (medium-low) and M1 (medium-high).
- provides the blower motor a direct path to ground through the blower motor switch, which allows the blower motor to operate in HI.
The temperature control actuates a cable attached directly to the temperature blend door located in the heater core housing.
The function selector switch:
- controls various mode door vacuum motors to determine the airflow position.
- enables blower motor operation.
- combines a vacuum switch and 2 electrical switches.
- supplies an A/C request signal to the powertrain control module (PCM) in MAX A/C, A/C, A/C RECIRC, DEF/FLOOR and DEFROST positions.
NO RELATED
Use the Manual With the Right Hardware
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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.