brianp38dse said:

OOOpps I undid a pipe and heard this hissing noise

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When you did that was the system cold or warm?

Dopey said:

When you did that was the system cold or warm?

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I was talking hypothetically about undoing the ac condenser pipes as he asked about having the system vaced down firstly
My thoughts are its the same as if you have a leaking system or involved in a crash it just goes to atmosphere.