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If you have moisture in the system you won't be able to pull a decent vacuum.
How are you determining the vacuum level is OK (under 500 microns)?
Is this an automotive system or ?
You may have a blockage though moisture can block your expansion device and create a blockage.
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Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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