"NSN" wrote in message

Each of them has gone bad after 3 or 4 years of use. What happens is
that the fan motor freezes up .. I assume that it is the bearings.

Does anyone have an idea of where I can purchase a replacement for the
fan motor?

Common problem with window ACs. Cheap sleeve bearing motors.

One source is www.repairclinic.com but I'm sure there are others if you do
a Google search on appliance parts.