The A/C Switch of Toyota Tercel gives you control over the cabin temperature by providing or cutting power to the air-conditioning circuit. A switch located in the dash next to the climate control module lets the system know what the driver is requesting so that the compressor and blower only respond when required, saving fuel and preventing an influx of cold air in winter and heat in summer. Early Tercel models utilized a standard mechanical A/C Switch integrated into a rotary climate knob, which by turning the knob selected vent position and completed the power circuit. Subsequent versions of dashboards applied by Toyota were equipped with a dedicated push-button A/C Switch with an integrated internal relay. This was done to ensure that airflow choices were separated from the compressor control, thus making the operation more intuitive. Each style of A/C Switch uses supporting relays that open or close the circuit to prevent components from continuous engagement. Contemporary Toyota circuitry has enhanced internal damping to lessen arcing at the contacts. If the A/C Switch fails, the circuit can get stuck either on or off, which can be uncomfortable and an unnecessary load on the engine. Any Tercel owner would be wise to recognize the symptoms of this.
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