I would ask how were they able to determine it was the evaporator, because it's really up there hidden inside the dash. Dye test? Refrigerant sniff detector? Vacuum test? Details of said test(s) performed?
Reason I would raise these questions is based on what you mentioned in your original post....
Quote:
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Originally Posted by wepio
"As of this morning, my '09 E92 AC no longer blows cold air. (worked fine last night)".
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From what I've gathered, refrigerant leaks are generally gradual, which would cause your a/c to gradually blow less and less cold. So I can't imagine your refrigerant just leaking overnight; that is unless there us a huge hole or a break in your lines.