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2 answers 3 comments
ANSWER by Visitor , July 17, 2010
A 1996 Audi A4 does not have a low pressure "port". It only has a low pressure switch that can be removed (jumper the switch connector), replaced by a 82272 Mastercool adapter that you can recharge through. I'd suggest you search a bit on the Internet, and you'll find a very useful page on how to do this.