Took it in to a shop the tested the vacuum and said that it was just fine as well as the freon is full
AC blows air but it is not cold at all on 1999 Ford Taurus
might look down at the compressor. these were bad to burn the clutch up on the compressor. compressor is on bottom of engine. stand at passenger side look down at belt follow it at front of engine to bottom. compressor there. usually rusty on front if burnt up.
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There are a lot of reasons the air could not be cold including but not limited to, electrical power supply to compressor, orifice tube, compressor failure and much more. If you want us to check this out please call 313-562-7022 or schedule an appointment on line at StansGarage.net. I am sure we can diagnose it and give you the answer you need.