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.
Temperature Selector Knob
The temperature selector actuates a variable resistance switch. This switch varies voltage to an electric actuator used to position temperature blend door.
Positioning temperature selector in any position between full cold setting and full hot setting causes the temperature blend door to direct more or less outside air through or around heater core for whatever proportion of heated or unheated outside air is desired. See Figure. The air blends together as it leaves the heater core and en ters the heater air plenum chamber for distribution.
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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.