Hi mate, i posted the same question weeks ago and didnt get one response, so i can only assume that there is only yourself and i with this problem,
to the best of my knowledge it will be a kinked cable from your control switch to you blower unit, i have spoken to people at TPS about this and they say the common parts used for this repair are two new upgraded cables, 7H2819835D and 7H2819837C, they are about £7 each , hope this helps

 

Hi Guys.

My central vents work perfect.
I can adjust the setting, and have them blowing as strong as the door vents.
Obviously - the more vents I have open the weaker the flow, but it's still acceptable.

The above applies to hot or cold - AC blows through centre vents and I do have to lower the flow after a while.

(I have a 2007 T32)

Regards

Brian.

 

as said probably an issue with the cables/controls/or unit itself, happy to take a look at it for you if you get stuck

Regards

Dan

 

When I bought my T4 (straight of the factory line at VW) it was missing two of the vent pipes behind the dash, result was gentle drafts from those dash outlets while everything else seemed OKish.

So is it new new or simply new to you?

You say generally ventilation is poor, try checking pollen filter (assuming it has one) they can get well blocked.

 

Dude, why are you shouting?! I:

 

Because his door vents are working so hard - he can't hear a bl00dy thing....

.

 

Is your air direction adjuster stiff. I had exactly the same problem. Apparently its a common fault. Mine was the cable behind that kinked. Found somewhere on here that showed exactly how to get to it and fix it. Straightened the cable and all is now cushdy.

 

Here you go http://www.brick-yard.co.uk/forum/how-to-fix-your-heater-cables-improved_topic49523.html