Your unit has a squirrel cage? Most have a bladed
fan, certainly my Carrier does. The blade is
attached directly to the motor shaft and it is the
motor that you oil. There should be an obvious
oil hole at each end of the motor, if not, it is a
permanently lubricated motor.
A squirrel cage looks like the wheels you see at pet stores that
gerbils and mice and maybe squirrels use for exercise. It's like a
round treadmill. It's cylindrical and all the blades are straight.
It's advantage is that it is quiet, and was/is used a lot in hi-fi
equipment (whether stereo or not.) so the noise of the fan won't be
But one of a reasonable size can't move enough air to work for an AC.
There is one poster on this list who is opposed to permanently
lubricated bearings, but the AC manufacturers are do not rely on him.
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