Have today expanded my ventilation according to the super instructions here
(Thank you for that) But you really should do this with 2 mann.But had no desire to run after the coals and time, so new blower engine for 119.- Euronen. And what a cool feeling if you drive and the car gets warm inside 
. The work of expanding the thing should therefore be done. It's not bad either.So the next one is the stupid dripping gear.
If someone comes from near Hamburg and has an idea of the thing, I would be grateful if he could take a look.
Then I know where to start.
So, always warm interior in winter.
Greetings Thomas
