The line from the washer jet to the washer fluid reservoir is made of plastic. Over time with so much exposure to water and changing temps they get very brittle and snap. You probably have a minor crack somewhere.
Not uncommon at all. I bought my car with the jets not working. Found out this was due to the line having about 5 splits. I replaced mine with rubber tubing instead.
I couldn't run the new line in the same position of the factory one because a big piece of it remained inside the chassis rail. To run the new rubber line, I fixed it to the outside of chassis rail, on the inside of the guard, and secured with flat cable clips. The tricky part is working out how to connect it to the bonnet without it getting crushed when the bonnet is closed. A bit of mucking around and you'll work it out. Annoying job though. Inside the bonnet I used plastic t-pieces to connect the jets. They will probably crack in a few years but I'm not worried - it only cost a few bucks. Metal would be heavy and would clang against the bonnet.
Also - don't forget to get a new set of jets just to make life easy. About $14/piece from VW.
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