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.
Recirculation Switch
The Recirculation Switch is a momentary contact switch. Toggling the switch on results in the A/C-Heater Control Module signaling the actuator to close the fresh-air door. Toggling the switch off results in the A/C-Heater Control Module signaling the actuator to open the fresh-air door. The switch status indicator illuminates when the switch is on. When the Power Switch is off, the A/C-Heater Control Module closes the fresh-air door to prevent outside air from entering the passenger compartment. The recirculation mode will cancel whenever defrost is requested. Pressing the Recirculation Switch while in defrost mode will illuminate the Recirculation Switch status indicator, but only while the button is pressed. Under this circumstance, the recirculation request will be denied and the fresh-air door will remain in the fresh position. All door positions are determined relative to the number of commutator pulses required to provide full travel of the door. On command, the A/C-Heater Control Module runs the actuator for the number of pulses corresponding to the desired door position.
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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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