Which of the statement is correct with regard to a manual air-conditioning system?
A. The air-conditioning system must be turned off manually if full engine power is necessary for accelerating
B. Although the driver or passenger can select the blower fan speed and the vent opening, the temperature cannot be adjusted
C. The driver or passenger can adjust the cooling performance. However, it is not possible to set a specific temperature which will be maintained constantly
D. The driver or passenger can adjust the temperature by changing the temperature setting valve
Answer: Option C
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