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International Automotive Technicians Network
Re: Fails vacuum leak test (badly) but can't find leak
Posted to HVAC Forum on 4/8/2021


One time I had a tech only hook the RRR machine to the high side. Similar scenario to your description of loss of vacuum. The low side service port valve (Schrader valve had a weak spring) wouldn't hold vacuum. Of course it would seat under pressure. S... Login to read more.