Removing suction fan for backrest surface

1. Detach cover for rear backrest at the top.
2. Unplug electric plug connection for suction fan.
3. Remove fastenings for suction fan.
   1. 3.1. Press plastic pins -1-  through the expansion rivets -2-  using a suitable mandrel.
   2. 3.2. Remove expansion rivets -2-  by pulling them towards the rear.
4. Pull suction fan -1-  out of the rubber flange (air guide) -2-  and remove it by pulling it towards the rear.