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Thread: Z3 freon leaks - shrader valves

  1. #1
    Join Date
    Aug 2007
    Location
    Chicago, IL
    Posts
    43
    My Cars
    '09 X6 - '04 745Li

    Z3 freon leaks - shrader valves

    I've discovered that my LOW PRESSURE shrader valve appears to be leaking. The valve looks like it can be replaced in it's entirety from the line, I could be mistaken.

    what is the normal process for repair, is the internal stem and o-rings only replaced?

    realoem.com shows the following part numbers and would like someone to confirm

    64-50-9-177-577 and 64-50-9-177-576

    Thank You
    '09 X6
    '04 745Li
    '97 Z3 1.9L
    '94 740iL
    '88 528e
    '94 Jaguar XJS
    '85 MB 380SL

  2. #2
    Join Date
    May 2012
    Location
    USA
    Posts
    1,170
    My Cars
    2000 BMW Z3 2.3 Auto
    I replaced both of them (high and low) based on real oem. Did the whole thing (like the part number you provided). Not internal parts. Had to replace all the parts of the AC except the lines. Evaporator, condensor and shrader valves were leaking. Compressor was weak

    The refrigerant + Pag oil have dye in it. So before you start working on it, check all the joints, condensor, compressor area and if possible, the evaporator (from the side) to see any leak. Doing all at once is easy. If you are replacing any parts, make sure you are using the right O-Rings

  3. #3
    Join Date
    Sep 2006
    Location
    Los Gatos CA
    Posts
    4,246
    My Cars
    1987 325is, e34, Z3, e39
    There is a very clever device which lets you change the schrader valve without discharging the system. They are $20-$50, depending on the quality you want.

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