I have 3 central carrier hvac systems for my house. On the outside
condenser for one of them the fan has gotten quite noisy. In fact it was
initially frozen in the beginning of the season. I got it going again.
The fans motors are mounted upside down in the top of the unit so you can't
see whether there is a spot for oil without taking the top grill off. I
figured I would ask to see whether these fans take oil before I take it
apart. And before anyone asks me about maintenence..... they were all
checked out last year by a reputable HVAC company but if they take oil
apparently the guy didn't bother lubricating them.