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Thread: Home A/C repair

  1. #1
    Join Date
    Apr 2004
    Posts
    34

    Default Home A/C repair

    Got a DIY question for the group.

    1993 525i Touring. The air blows cold and everything works fine when it is charged. Problem is, it leaks. I used a dye and found that it is leaking at the compressor where the high and low pressure hoses attach.

    Looking at the parts diagram I see a small O ring in both spots. Keeping in mind that this is a 200k mile car, can I just unscrew the 2 hoses put in the new O rings, recharge and go? What potential damage can I do? Anyone know what size allen head is needed?

    -Steve
    Steve
    1989 M3
    1995 525i 5sp
    1993 525iT

  2. #2
    Join Date
    Dec 2003
    Location
    PA
    Posts
    5,403

    Default

    Thats about all you have to do - you will lose a ton of refrigerant however. I think its a 6mm, maybe 7mm... i took mine off a couple weeks ago. If you want new hoses that do not leak let me know I have them all.

  3. #3
    Join Date
    Oct 2005
    Posts
    518

    Default

    Generally its best to let a shop remove the refrigerant from the system before you open it up. When you complete the repair, its recommended that you put the system under vacuum to remove any air, moisture, and contaminants that may be in the lines. Then you can charge it with refrigerant. Hope this helps.

  4. #4
    Join Date
    Feb 2004
    Posts
    4,894

    Default

    Ditto... you need to vacuum the system before refilling with refrigerant. You probably have R-134a already. You do need to evacuate system before taking that hose off. And yes, just the oring will do.

    There is one other thing... try tightening it up more to see if it holds. Then you don't have to do the whole deal.

  5. #5
    Join Date
    Oct 2004
    Location
    Honolulu
    Posts
    3,105

    Default New Drier Too

    This will help ensure a clean and dry system


    Vee ave vays of dealing vid your kind...........

  6. #6
    Join Date
    Feb 2005
    Location
    Houston, TX, USA
    Posts
    137

    Default

    If you open it, it will be relatively messy, but tolerable.
    You might be able to find a shop that will let you supply your own refrigerant and only charge labor to vacuum and charge the system. I did this and they only charged me an hour of labor.
    Ryan
    1994 525iT

  7. #7
    Join Date
    Feb 2005
    Location
    Houston, TX, USA
    Posts
    137

    Default

    Oh, and Bob's right about the drier--cheap part that should be replaced every time you open that system up.
    Ryan
    1994 525iT

  8. #8
    Join Date
    Dec 2004
    Location
    Sydney, Australia
    Posts
    4,374

    Default

    Quote Originally Posted by rps1072
    Oh, and Bob's right about the drier--cheap part that should be replaced every time you open that system up.
    Venting is bad- besides never open it without changing the dryer and never allow the drier to remain open to the atmosphere for long- it should be unsealed only immediately before fitting her in to the system. Do not open the system and then expect it to last if you let atmosphere or dirt enter and use it.

    I'd tighten the connections 1mm or so (to move the thread) and take them up a bit to say what feels like around 50 ft/lbs, then clean and check for leaks a a day or two of use after that.

    If you end up going into the shop, take a drier (new driers are $20 on eBay); most shops only charge for their time and the refridgerant they use... nick
    Last edited by genphreak; 05-03-2006 at 04:27 AM.

    Join the Aussie
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    08/88 535i e34 M30+miller MAF, 'stiens, tints & teeth!

  9. #9
    Join Date
    May 2004
    Location
    Sydney, Australia
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    2,699

    Default

    what is a drier?

  10. #10
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    Dec 2003
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    PA
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    Default

    pulls moisture out of the compressed gases

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