i had a similar problem , my sight glass was leaking on 15 YEAR
OLD SYSTEM. 5 companies were willing to add freon, suggested a new
system ,and were unwilling to repair the leak. i fixed it myself by
removing the sightglass and connected line without it.i vacumed it and
filled with r22 ...been working for 7 years. most companies now are
ripoff artists thanks to freon regulation.. lucas

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