2005 Kia Spectra BAD A/C 2005 Kia Spectra5

Hi, Ive been having a problem with my A/C unit, It started with the fan sucking garbage in and clogging the ducts. I cleaned it, and it worked fine for a few weeks, then it would blow cold air and then none at all, then white fog would come out of the vents. Finally stopped working, not the compressor does not engage. I took it to the mechanic, checked fuses and are ok. He jumped the compressor and works fine, freon levels are good, but when you turn the nobs on, the compressor still does not kick in, the "a/c experts" could not do anything to fix this and is annoying to drive in a heater box. I think the A/C temp sensor or thermostat is the problem cuz the evaporator is boiling hot, it feels like a stove on high, I dont know, any better ideas?