Hope I'm not too late Todd....
If you haven't already......here's an idea for you. The brushes in the blower moter may be worn down. Mine are/were and temp fixed by shimming behind the brushes. I have to get new ones this next week due to my blower stopped working again but for a while it ran like a new one. Brushes are simple to replace if you have a soldering iron.
1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)