Help! My furnace area had NO place for a filter, used a flashlight to look around, and it was extremely full of dirty sticky dust, so master maintenance fanatic that I am, took my vacuum cleaner and a dry paint brush to dust fan blades and clean general area, took care in not disturbing wiring or dials, feeling pretty good that I may have headed of any issues later. Well, as it turns out I am wrong, it WAS working all fine, quieter, lots of dust from floor vents though. Everything appeared to be running well and cooling. Until today, everything appears fine w/furnace part,blower etc. the air conditioner is not kicking on, the fan on furnace runs but not much air flow coming out of floor vents. Is there something else that I will need to look for and clean, wondering if all that loosened up dust clogged something deeper inside? My Coleman furnace # model-767OC856 # serial-118364677. Air conditioner unit # model- 7830-901 #serial-128308199. This question is from Kim

In your attempt to clean things, you probably loosened enough dirt to foul the a/c evaporator coil which is under the furnace. There are filter kits available for your furnace.

Most coleman furnaces the filter/filters are designed to go inside/cover the door from the inside