Originally Posted by Diesel911

Sounds to me like you need to go back into the Blower Motor and inspect it and all of the Wireing connections.

I took my Blower Motor apart expecting to find worn Brushes and what I found was a corroded connection where it was crimped onto the wire going to the Brushes (I have a Siemans not a Bosch Blower Motor).

Also there is a square Box with holes in it on the Front Passanger Side Fender Well that is the Resistor for the Blower. That or the Wiring to it could have issues.