Welcome to the forum-
Regarding your questions- for the heater blower, there are lots of posts but try this one: R&R heater motor
Regarding the shifter, it sounds like your shifter bushings need to be replaced. Use the search feature using key words such as: shifter bushings 190e
The 190E 8v do not require valve adjustments, but you might want to check the entire valve train while you are in there.
Keep us posted,