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Yes the system was properly evacuated and recharged to the proper amount and the sight glass shows the freon moving just like it should. Here is the weird thing it did the same thing last year, the expansion valve quit making noise and the a/c quit blowing cold so I replaced the drier pulled vacuum on the system and recharged and the expansion valve started making the hissing sound and the a/c worked great. So I think I may have to replace the expansin valve flush the evaporetor pull vacuum and recharge. Also does anyone elses expansion valve make a hissing sound my 85 also does it with a full charged R12 system and it works great.
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