How to lubricate fan bearings in furnace?
So in our 27-year-old Winnebago Warrior, we have a Suburban NT30KLT furnace. In the last couple of years, the first time it fires up you can hear the fan bearing squalling a bit and then it quiets ...
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I don't think they have bearings - some have had luck with squirting oil. I have had some luck eliminating squeaks with various automobile fans by running them for an hour or so. I rarely use the heater in my 92 and when I started to get squeak I let the heater run for an hour ... that was 3 years ago and haven't heard a squeak since. I didn't think there was much downside - if my MacGyver didn't work then I was prepared to replace the motor. Worth a shot.
