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Hello: Unfortunately those couplers are probably aftermarket Chinese. You will be better off with genuine parts. Try Jim Ellis VW in Atlanta, their prices are the lowest you will find anywhere. For example your hoses (1K0-122-157-HP) are $44.00 Plus taxes and shipping. The couplers are $26.00 each. Try to use the spring clamps that came originally with the hoses as they will exert the right amount of pressure and not crack the couplers.
One strategy you can use is to go to your local VW parts dealer and ask the parts manager if he will match Jim Ellis's prices. This has worked for me, don't let them rip you off!
As far the A/C not working, this is probably what happened to me, it was the compressor control valve. If your system is charged but no A/C this is probably the cause. About $60.00 on Amazon or anywhere else. Don't let the experts tell you you need a new compressor before you try replacing this valve. The refrigerant will need to be drained by an air conditioning shop before you can replace the valve (located in the compressor itself)
Hope this helps some. Good luck.
 
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