Our '83 240D did that years ago. I pulled the blower motor out and cleaned and lubricated the bearings. It's been so long ago I can't be any more specific. That cured my fuse blowing problem. The motor just had too much drag. Hope this helps you.

srharvey
'82 SL 150M
'83 240 D 250M
'93 300TE 4Matic 298M