1989 300CE

Blower motor quit. After searching I've seen reference to the"tap" method of short term fix. I'd love to try it before tearing this thing apart (again). Do I have to remove monowiper and squirrel cages to use this sophisticated repair technique? Or can I get at the blower motor from under the passenger side dash?

I know it is inevitable that I will have to take things apart, but DIY fatigue is setting in.

thanks

oops - unrelated, but, how much new brake fluid should I have on hand to flush/change out my old brake fluid?