Question about 1996 Audi A4

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Low pressure valve in Audi A4 1996

This car did not have a low pressure valve, after the firewall the two pipes are plain, one have sensor relay and the other one is plain, I plan to cut one of the pipes and install a low pressure valve, but I dont have a part list to do the job can you give a hand.

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  • nojaimes Aug 28, 2008

    How I know is the low pressure pipe?

  • Anonymous Apr 11, 2009

    I removed the low side switch and the A/C fitting in the tubing has a Schrader valve. Where can I buy an adapter that will allow me to hook up to my R12 or R134a gauge suction hose? The Audi dealership states they do not offer one.

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THE AUDI ONLY HAVE ONE PORT LOCATED UNDER THE HOOD IN FRONT OF THE RADITOR ON THE LEFT SIDE WITH THE RED CAP.....YOU HAVE TO FIND A ADAPTER TO FIT THE FITTING......

Posted on Mar 15, 2009

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  • Audi Master
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Does it have a cycling low pressure switch in the low side line? If so remove it and charge through that port. Audi makes a tool for charging the AC.

Posted on Aug 28, 2008

  • yadayada
    yadayada Aug 28, 2008

    It is the larger pipe.

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The factory doesn't provide a stand alone low side charging port, the only way I see to get to it is to take off the low pressure switch, and hook your gauges to the schrader valve. This will require an adapter, though.
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