is it possible that blower motor is not working properly? its sound like fine but...?

now i put + and - other way to makse sure it runs right direction.

I removed viper arms and cleaned all over the blower box.
I put power straight from the battery to make sure it works full power.

Allredy done that, no trash or defect there

Hello,
Im Harri and im new hear, Im from Estonia that means my english is not perfect, i hope you understand my writings.
My 1992 sse bonneville blow air very poorly. No differences is it cold or warm. Equally poor if i turn to the feet, window or dash.
All speeds working, blower motor runs fine ...