We have an older buck stove (I belive it's a 27000). The fan motor started making noise like it was out of balance so we removed it and inspected it. This motor was just replaced last year and has been used some already this season. After fixing the noise it seems like we aren't getting the proper air movement when it is running. We seem to be getting air coming out the cold air inlets and nothing really coming out the warm air outlets. What could be causing this? Could it be fan placement, or blades not positioned correctly? We didn't have this problem before recently removing it to deal with the out of balance noise.