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.
Air Cleaner - Thermostatic: Operation: Notes
When temperature of air entering air cleaner is less than calibrated temperature of temperature sensor, sensor closes. This allows engine vacuum to operate vacuum motor.
When engine vacuum is applied to vacuum motor, door closes off outside air. Air is then drawn into air cleaner from around exhaust manifold.
As air inside air cleaner warms, temperature sensor begins to open. This gradually bleeds off vacuum to vacuum motor. As vacuum to vacuum motor decreases, air control door begins to open.
As air control door opens, outside air is allowed to enter air cleaner assembly. When air entering air cleaner reaches a predetermined temperature, air control door opens completely. This completely closes off air from around exhaust manifold.
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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.