To pop out the climate control box, all you have to do is stick your finger underneath it, find the hole with the clip in it, push in, and pull out. The whole thing will come out. Just unhook it and flip it over. You can try just using some compressed air and blowing it out. It's probably pretty dusty in there. Make sure you get every nook and cranny you can. If that doesn't help then you have to get a new blower, but I don't think they're more than $20, and you just screw a new one in.