The driver is able to control the temperature in the cabin with the Ford Crown Victoria A/C Switch. The dash controls communicate with relays that power on or off the air conditioning circuit. Thus, the driver will have their temperature controlled instantly at the touch of a button or turn of a knob. Each Crown Victoria's A/C Switch sends a low-current signal to wake the climate control module, which then directs the compressors, blower motors, and blend doors to cool or heat as asked. The straightforward three-speed A/C Switch applied on early Ford sedans was basically a pair of simple contacts that either closed a circuit or left it open, which did the job, although not very sophisticated. In later years, Ford decided to make police interceptors and civilian models use an automatic temperature control version of the A/C Switch. This version works with a power module. This allows the controller to almost infinitely vary blower speed. Due to the data from inside and outside sensors, the controller can vary blower speed automatically. Every Crown Victoria, regardless of trim, employs an A/C Switch built to interrupt the relay before the compressor can draw power to prevent parasitic loss. In line with Ford's tough tradition, the A/C Switch features robust contacts that can withstand arcing. Ford built both versions to save fuel and keep the Crown Victoria's interior comfortable year-round.
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