Crazy squeaking HVAC fan

[Rooscooter]

After doing a few searches I didn't see anything on this...

My HVAC fan is squeaking but it's intermittent and seems to depend on whether or not I'm accelerating or decelerating. On setting 2 it squeaks while I'm stopped but as I accelerate it stops and when I'm at a constant speed it isn't squeaking. When I start to slow down it squeaks like crazy.

Anyone else had anything like this?

In looking at the manual it doesn't look like a difficult replacement but just wondering if it a quick fix otherwise.

Fan runs on all settings just fine. It does in more when heating than with AC but still does it.

In looking at the manual it doesn't look like a difficult replacement but just wondering if it a quick fix otherwise.

 

[CharlesHS]

The fan motor bushing/bearing is dry and the change in load on the fan blade makes the bushing/bearing squeal.
You could remove the fan motor and apply a couple drips of light weight oil to the bushing/bearing to test this theory,
While the oil will prolong the life of the bushing/bearing; more than likely the squealing will return in the future.
Probably a good idea to put an order in for a new fan motor before it stops working.

 

[Rooscooter]

The fan motor bushing/bearing is dry and the change in load on the fan blade makes the bushing/bearing squeal.
You could remove the fan motor and apply a couple drips of light weight oil to the bushing/bearing to test this theory,
While the oil will prolong the life of the bushing/bearing; more than likely the squealing will return in the future.
Probably a good idea to put an order in for a new fan motor before it stops working.

That's my theory as well.

I'm going to pull the fan tomorrow and see what I can see in there.