I asked a few people about this and they said the blower/motor needs lubricated but I don't see where to do this. The front panel says to apply 2-3 drops of SAE motor oil but it did not list where to do so. The number on the blower panel is 902993, serial EE9711-0442. A 2-speed blower P/N-903074, NO...

I did that, but the noise got worse and I think it sounds like the wheel or blower is squealing like it is rusted or rubbing against something, like it needs oiled. Everything else works ok.

While running sometimes there is a whistling noise. Still heats fine, nothing blocking the blower that I can tell. Doesn't do it all the time, mostly when it has been running for long periods of time. It kind of sound like it is coming from the blower area but hard to tell.Suggestions?