Our '01 HVAC blower has been squeaking for a few years...mostly on low speed, occasionally on higher fan speeds.
But, it still blows well and the orig A/C charge is freezer cold and the heater pumps out heat like a wood stove.
A well regarded Indie I visit every couple of years 'hates the R&R job' on these, and quoted 4-5 hrs labor for that fairly inexpensive part replacement...
I drive it less and less, so I will keep fingers crossed and we shall see.
Not a DIY for me, here in my post mid 70s.
Pic of typical 'fix'; looks like open body 'surgery'.