It appears that some Golf owner my develop a squeek from behind the dash which ceases if you turn the heater to hot. This is a problem from another forum.
Now I don't know if its connected but VW do a mod and you can download the details from a German site which is a doc file in German. I've downloaded it for reference and I've used
Babelfish to do a German to English conversion.
Golf 6 vehicles the possibility exists that with the meeting of unfavourable tolerances when assembling the floor space outlet on the driver's side can possibly separate from the connection of the heater box. Thus the driver floor space can be supplied noticeably less or not at all with warm air.
It appears they use a special cable strap and a new action sticker in the boot. Remachining floor space outlet driver's side link steering wheel.
I can't post the link to this German site or the other forum unless you join but if anyone is interested in this fault then let me know and I'll post the English translation.