No, setting the car's air conditioning (AC) system to the highest or lowest temperature initially and then adjusting it to the desired temperature does not make it heat or cool faster than directly setting it to the desired temperature.
The AC system in a car works by adjusting the flow and temperature of the air that is being circulated inside the vehicle. When you set the AC to a specific temperature, the system will work to achieve and maintain that temperature by regulating the cooling or heating output.
Setting the AC to the highest or lowest temperature initially only causes the system to work at its maximum capacity initially, which may not be necessary or efficient. It doesn't necessarily result in faster cooling or heating because the system will still need to adjust and stabilize at the desired temperature eventually.
In general, it is more efficient to set the AC to the desired temperature directly. Modern car AC systems are designed to provide comfortable temperatures efficiently and adjust the cooling or heating output as needed to maintain the set temperature.