AC诊断新进展和新问题求助

 

接着上次的AC问题，诊断有新进展， 用 MGS 读出如下：

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.

新问题: 这诊断可靠吗？ 怎么查 expansion valve gas leakage？最可能的root cause? 谢谢分享你的经验！

MGS reading picture: