今天一位车主发现每天早上前挡风玻璃内侧都会有一层雾,一直不明白怎么回事,今天过来保养的时候,和我说起这件事,今天借着这个问题给大家讲解一下为什么挡风玻璃内侧会起雾,该车又是因为什么原因起雾的呢?
雾是什么东西,说白了就是空气中的水分冷凝成的露珠时,什么情况下会起雾呢?
温度降低到一定程度时,也就是说必须有一定温差的情况下,湿度会达到饱和,后变成露珠,这个温度叫做露点温度。
下图是焓湿图,可以根据任意温度和湿度算出露点温度
阴雨天空气湿度大,假设外界温度31度,湿度64%,那么当温度降低到23度时,空气湿度会等于100%,如果温度继续降低(打开空调),多余的水分就会从空气中释放出来,形成雾气。
该车的情况是早晨的时候挡风玻璃内侧起雾,我们分析一下,只有温差的情况下才会出现雾气,该车在白天开车没有开空调,行驶时一直开窗,那么晚上停车时,车内外温度一致,理论上是不会出现雾气的。
如果车主停车之前一直开空调,车内温度保持在10度左右,那也应该是挡风玻璃外侧起雾,但是空调关闭后,挡风玻璃上的雾气大概10分钟左右的时间后就会消失。
所以该车是另有原因,这里先卖个关子,原因最后再说~
首先我坐进驾驶室时,发现车内霉味特别重,拆卸空调滤芯检查没有发现进水痕迹。怀疑车内进水,因为前几天刚下过两场雨。掀起地毯,下图可以看到全是水啊~~~
车主铺了两层地胶,现在铺地胶的车主越来越少了,这东西压根就没用,地毯吸附的潮气也排不出去,积水这么严重了,也发现不了,所以铺地胶有百害无一利。
现在有全包胶垫了,实用,好用,美观,可以拆卸清洗很方便。
我们继续说说积水原因,副驾驶没有及时,这说明主驾驶的某一个地方有漏水的地方,天窗排水孔堵塞或者地板工艺孔密封堵脱落。
拆下顶棚发现顶棚依旧腐烂,天窗排水管脱落。导致雨水顺着A柱饰板流到了主驾驶地毯上,这是其中一个原因。
拆卸雨刮器导流板,检查U型槽内全是树叶、泥沙,排水孔已经完全堵死。
清理干净后,测试,正常叶子板内侧有一个排水孔,会流水,但是该车并没有流水。该车有一个设计缺陷,U型槽排水孔上方2厘米处有一个车身工艺孔,密封堵没有了,如果积水或者雨水过大,来不及排出去,导致水顺着工艺孔流到车内,孔的位置在刹车踏板前方,水流到主驾地毯上。
这两个原因最终导致主驾驶地毯积水严重。
所以该车的故障原因就是:车内积水导致空气湿度大,加上现在天气越来越热,水分蒸发后附着在挡风玻璃内侧。
原创文章,作者:cesifu,如若转载,请注明出处:http://www.cesifu.com/article/27629.html
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