Originally Posted by trader4

Paradoxically low refrigerant in an AC system can cause it to freeze
up. I was having problems with mine where once in awhile it
would freeze up, sometimes you'd see just a bit of fog coming out.
It happened rarely, so I didn't pay much attention. Then at some
point it wasn't blowing cold enough air. So, I recharged it. I
immediately had cold air again and the icing never happened again.
The funny thing though is that I fully expected that I'd have to
recharge it again in a year or so, because somehow it leaked out.
But that was several years ago now and it's still working fine.

I just used one of the $20 can with gauge kits available at the
auto parts stores. If you're adding refrigerant, might as well
get the kit that has dye in the can and includes a UV penlight
so you can look for leaks.

And if you can hear the blower running, then it's not an FSR problem.
My best guess at this point is it's low on charge.