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:
