[Cusser]

No air filter on a '93. I wonder if your evaporator is clogged (due to a leak) and the refrigeration oil has mixed with dust to block it, might be the cause of both your problems. I think a specialty auto AC shop could use an electronic sniffer to see if the evaporator is leaking.

Maybe your fan blower cage is loose on your blower motor shaft, causing the noise and low air volume???

Those R4 compressers are also known to "belly leak".