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 Lever
When in "OFF" position, blower motor circuit is open, heater-defrost door is closed, and there is no air flow in the system. When in "HEAT" position, heater-defrost door moves to discharge air from plenum chamber to floor area. A small amount is directed to defroster outlets. In "DEFROST" position, heater-defrost door directs air to defroster nozzles.
Air flow may be modulated between heat and defrost outlets by moving mode control lever. Heating can be obtained from auxiliary heater by moving mode selector any heating position, moving auxiliary mode lever to any position and turning auxiliary blower switch to any blower speed.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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