[ppp111]

By the way -
do you know how to get to the "0-5" switch to check/clean it (if can be cleaned at all)?
On the driver side it feels like not responding till in "0-4" position and then towards 5 it inflates very well.
Probably there is a way to remove this plastic side cover.
(W140 1991)

 

[ppp111]

Thanks for this hint. But where to start in order to not brake things (back, front, bottom...?).
Maybe you know? - in two sentences...
And did you go throught that? Can the switch be dismantled for cleaning?