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.
Mode Selector
Mode selector knob controls a vacuum-operated rotary selector valve. Mode selector routes engine vacuum to operate air delivery door actuators, providing desired air distribution. It also allows for selection of air conditioning or heating functions. See Figure. Mode selector knob positions are OFF, A/C, MAX A/C, BI-LEVEL A/C, VENT, BI-LEVEL, FLOOR, MIX-BLEND, and FRONT DEFROST. See FRONT HVAC MODE POSITIONS .
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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.