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In sometimes the handkerchief sutter B5 travel the air conditioning stops the movement
http://www.enpinfo.com/Engine/Tech/Project/200812/24058.html
?而萨特B5行驶中空调有时停止?畚行
Breakdown phenomenon:
In a handkerchief sutter B5 travel process sudden air conditioning stop movement,
but sometimes restores normally.
Breakdown solution: Unifies the question which the vehicle owner reflected and tests a car, thought initially possibly is the air conditioning pressure is excessively high causes the compressor not to work.
Therefore first overhauls air-conditioning system's pipeline, discovered that the air conditioning pressure in the normal range,
simultaneously carried on the clean to the condenser and the evaporation box,
the confirmation cooling system has been good.
Tests a car once more,
discovered that this vehicle air conditioning vanishes suddenly,
the compressor does not work.
Confirmed after the analysis,
compressor generally when the following several kind of situations does not work:
①Engine anxious acceleration operating mode.
②The water temperature is higher than 125℃.
③Air-conditioning system's high tension system pressure is bigger than 320kPa.
But after the inspection,
these situations does not exist,
that is only left over electric circuit's question.
First overhauls air-conditioning system's fuse,
all normal.
In this air conditioning electric circuit,
air-conditioning system pressure switch F129 is very important.
Its leading role is when the system hypotonia (is probably smaller than 200kPa),
cut-off air conditioning compressor,
when the pressure is too high (probably is bigger than 3000kPa),
the cut-off system work,
protects the compressor;
When the refrigerant circulating pressure elevates,
enhances the radiation ventilator wind speed,
optimizes the condenser performance.
Tears off the air conditioning pressure switch F129 plug,
when a/C switch puts through, surveys 2 end brown/white lines to be the 12V voltage, the actual measurement result is 0V.
Therefore the search voltage unusual reason,
is suitable is connecting the line,
discovers changes the boost pump pot decoration left side of the engine to cover has one transits 4 needles to transform the plug, after tearing off,
discovered that the attachment did not know,
because what kind of reason is immersed,
has been oxidized creates the air conditioning line bad.
After clean attachment, trouble shooting.
Summary:
Regarding air conditioning breakdown,
only then the thorough understanding air conditioning principle of work,
the sensor,
the pressure switch function as well as the control wiring,
can quickly solve the problem.
故障现象：一辆?而萨特Ｂ５行驶过程中突然空调停止?畚行，但有时又恢复正常。
故障解决：结合车主反映的问题并试车，初步认为可能是空调压力过高导致压缩机不工作。为此首先检修空调系统的管路，发现空调压力在正常范围内，同时对冷凝器和蒸发箱进行了清洗，??认散热系统良好。再次试车，发现该车冷气突然消失，压缩机不工作。经过分析??认，压缩机一般在以下几种情况时不工作：①发动机急加速工况。②水温高于１２５℃。③空调系统的高压系统压力大于３２０ｋＰａ。可是经过检查，这些情况都不存在，那就只剩下电路的问题。首先检修空调系统的熔丝，一切正常。在该空调电路里，空调系统压力开关Ｆ１２９很重要。它的主要作用是当系统压力过低（大约小于２００ｋＰａ）时，切断空调压缩机，当压力太高（大约大于３０００ｋＰａ）时，切断系统工作，以保护压缩机；当制冷剂循环压力升高时，提高散热风扇风速，优化冷凝器性能。拔下空调压力开关Ｆ１２９插头，当Ａ/Ｃ开关接通时，测量２号端棕/白线应为１２Ｖ电压，实际测量结果为０Ｖ。于是查找电压?尺常的原因，顺着连接线路，发现在发动机左侧转向助力泵罐饰罩下有一过渡４针转换插头，拔下后发现接头不知由于何种原因被浸水，已被?椴化造成空调线路不良。清洁接头后故障排除。
总结：对于空调故障，只有全面了解空调工作原理、传感器、压力开关功能以及控制线路，才能又快又准地解决问题。
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