推荐回答（1个）
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分清电源种类。
汽车暖风机并不是常电，而是由IG1供电，也就是说只有打开点火开关后，暖风电机才会工作。
暖风继电器。
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暖风电机属于大功率用电设备，车上设置了继电器让电瓶直接给暖风机供电。
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1档电路走向。
暖风机有四个档位，经过不同的电阻就会显示不同的档位，吹出不同的风量，1档风量小，经过的电阻最多。
2档电路走向。
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2档经过了两个电阻，风量要比1档大。
3档电路走向。
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3档中只串联了一个电阻，风量比2档还要大，当然相对来说鼓风机的声音也较大，制冷或制热都比较快。
最高档走向。
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暖风机最高档是直接档，中间没有串联任何电阻，想要快速制冷或制热可以选择这个档位，等达到合适的温度后就可以把减小档位。
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AC开关信
想要空调制冷就要按下AC,当然前提是把暖风机打开，从电路图上也能看出无论处于哪个档位，暖风机开关都在向AC开关供电。
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