If the blower motor is vibrating, I would start by removing it. I have seen cases where the rodent met it's maker at the blower fan, and that is what was causing the imbalance(vibration). They also may have built a nest that ended up at the blower. As far as cleaning the vents, that could be labor intensive, as there is no easy way other than complete disassembly.
Saturday, July 16th, 2011 AT 3:47 PM