As you may have read in the post about the clicking noise behind the glove box, I too have had problems with my heating system... I compared my car against another passat and found that not only was I suffering from the clicking noise but the fan wasn't working at all.

So I ordered a new fan (ebay, not VW) and yesterday I went to fit it, removed the glove box and... fan wasn't connected... Refitted the connector and wahey, fan works!

It would appear that when the Nokia hands free kit was fitted, the bundle of excesse wires rested on the fan wire and over time pulled it out...

Still got the valve thing to replace. but at least I can see when I drive now!

Cheers, Bryce