Air with little flow

If you put it at 1,2,3 and it does not make any change is the internal fan engine resistance if instead marks the speed but does not come out air if it can be in cover filter covered or the covered evaporator, sometimes the blocked window stays but it is very rare.-Safe

Exit leaves little air but nevertheless if I hear that the fan engine that increases the revolutions and makes more noise, when changing number.

How can I get to the "room filter" and the evaporator to see if they are obstructed?
Or see if the blocked window has stayed?
I have no manual to tell me where those pieces are.
Greetings and thanks

It is already effectively solved is the habitaculum filter,
and for those who look for it in the bending, it is located under the dashboard (under top) on the side of the companion covered with a lid of about 10 cm and 2 screws, look good at the time of removing it because the filter brings a painted arrow and the new one must go in the same position. .
In Principiolo that I have done is to wash it with water and water

Hello
before disarming anything, the particle filter changes the safest thing is that it is covered

Greetings
before disassembling any part, change the Plenum particles filter sure it is covered and that is why there is no air flow