I expressed a wish to the driver to regulate the temperature, but he was extremely rude to me as well as to other passengers.

regulate 是动词，由词根 regul-（来自拉丁语 regula，意为"规则"）和后缀 -ate（表示"使...化"）组成，字面意思是"使符合规则"。在这里指"调节、控制（温度）"，即让温度保持在合适的范围内。