AC診斷新進展和新問題求助

 

接著上次的AC問題，診斷有新進展， 用 MGS 讀出如下：

Low side: zero pressure or vacuum; High side: very low pressure;

Service manual Diagnosis: Refrigerant does not circulate; refrigerant flow obstructed by moisture or dirt in system, or by gas leakage from expansion value.

Possible Remedy: Check expansion valve (EV); Clean out dirt in EV; Replace receiver; Evacuate air and charge new refrigerant to proper amount; Replace EV if gas leakage from expansion valve.

新問題: 這診斷可靠嗎？ 怎麽查 expansion valve gas leakage？最可能的root cause? 謝謝分享你的經驗！

MGS reading picture:

 

所有跟帖： 

• 什麽車 -滿地找牙- ♂ (138 bytes) () 03/06/2013 postreply 07:26:24

• 車是西耶那. 有誰拆換過AC Expansion Valve？ -Gulang- ♂ (0 bytes) () 03/06/2013 postreply 18:43:35

• 兄弟，真正的考驗你ＤＩＹ的時刻來到了。過了這一關就隻有引擎 -x88- ♂ (302 bytes) () 03/06/2013 postreply 11:30:05

• 謝謝指點。If I dont need the car for daily commute, then would love t -Gulang- ♂ (222 bytes) () 03/06/2013 postreply 18:54:33

• 應該是過了這一關就隻有引擎和變速箱.AC跟那兩樣東西沒法比 -滿地找牙- ♂ (0 bytes) () 03/06/2013 postreply 19:10:57

• Agreed, and you can be addicted to fixing things. Next step is a -Gulang- ♂ (0 bytes) () 03/06/2013 postreply 19:28:44

• 忘了變速箱了，你看這記性。 -x88- ♂ (0 bytes) () 03/06/2013 postreply 20:34:44

• 回複：AC診斷新進展和新問題求助 -追風大老虎- ♀ (167 bytes) () 03/07/2013 postreply 10:35:54

• 老虎的說法可靠 -biglow- ♂ (39 bytes) () 03/07/2013 postreply 11:39:24

• 謝謝追風。但願是冷媒沒加夠， 但是。。。 -Gulang- ♂ (208 bytes) () 03/07/2013 postreply 18:00:34

• Have you pressed down lowside valve after shuting off the engine -MoonRivertttt- ♂ (43 bytes) () 03/07/2013 postreply 18:51:00

• Yes, tried pressing down a bit, heard air came out. Also hear th -Gulang- ♂ (77 bytes) () 03/07/2013 postreply 19:25:19

• 所謂壓縮機實際上是真空泵，抽氣機。低壓端被抽真空了。 -追風大老虎- ♀ (0 bytes) () 03/08/2013 postreply 10:53:56