I put a new two-speed blower motor in my evaporative cooler yesterday.
The motor makes a pretty loud buzzing/humming noise. It does it with belt
off so it's the motor, not the blower. It's not the water pump. Checked
current draw with clamp-on meter and it's slightly (0.1 A or so) below or
equal to rated current marked on motor with the belt on. It's louder on
low speed - maybe because blower is quieter?). Other than the noise it
seems to work ok. I ran it for about 9 hours yesterday at low speed
(which I normally use) with no problems.

Just ignore the noise? I can live with it if it isn't trying to tell me
it's in trouble.

TIA.

Ken


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