Thanks guys, I'll check the amperage draw after I replace the worn brushes on the blower motor, before ordering a new one. This is the original though on car with 235k miles so I wouldn't be surprised if it's gone south.
I think I saw 20 amps max full speed? Does that sound about right? I'll hook it up to a battery in a bit and report back.
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi