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 Control Lever Operation
When this lever is placed in COOL position, the restrictor air door and the temperature blend door restrict the passage of air through the heater core, the heater water valve is closed and cool air is discharged through the instrument panel registers, floor outlets or defrosters. In moving the lever toward WARM the water valve vacuum switch is released and the heater water valve is opened, the restrictor air door and temperature blend door vacuum motors are modulated by partial vacuum allowing air through the heater core to be mixed with cool air and discharged through the plenum outlets. When the lever is positioned at WARM, all air passes through the heater core to provide maximum discharge air temperature.
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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.