I've had a noise in my aftermarket underdash AC blower for a few months that has been driving me nuts. Its an old Frigiking unit that works quite well otherwise. So today, I decided to try to seperate the 2 halves of the evaporator unit without actually discharging the system. Once I got into it, it wasn't that bad. I found my original heater blower switch knob, some stamps, a piece of paper, a dirt dobbers next, and various other bugs inside the housing. Once I removed the blower motor itself, the cages were full of bugs and thick dust. The back of the evaporator was nearly completely clogged with dust. Once I got everything cleaned up, its operating as quiet as a church mouse. I don't know if it is cooling better but it certainly has more air volume now. So glad to have it done!