问：引擎发出奇怪的声音和振动

通过这些症状组合，听起来您的汽车有驱动皮带问题。当室外冷时，初始启动时皮带上有更多负载。换句话说，滑轮更难转。发生这种情况时，转向液通常厚，交流发电机会充电略微排干电池，并且交流压缩机油也会变稠。检查引擎灯可能是一个巧合，但也可能有助于找到问题。即使现在熄灭，代码也将存储。您在AC提到的问题也是一个强烈的线索。如果离合器很弱，它可能会滑落并起初发出噪音。当您的加热器控件处于碎屑位置或地板和碎屑状态时，这会自动命令AC压缩机除湿空气。如果每个寒冷的早晨都会发生噪音，请尝试将加热器完全离开，看看噪音是否停止。 If it does, then this could be one explanation for the noise. The belt itself could also be slipping - indicating a worn belt or tensioner. I would think that the dealer would probably have spotted this though. One more possibility is that the harmonic balancer has failed. The pulley that drives the accessories is connected to the crankshaft through a piece of rubber that’s bonded to each piece. The bond can break and it will intermittently slip, usually under heavy load or when it is raining. A qualified mechanic, such as one from YourMechanic, can come and inspect the related parts to确定是什么导致汽车的奇怪声音。