93 taurus, 3.0 engine automatic trans... R-12 air cond. unit... this morning the a/c was putting out real cold for the 20 minute of citydriving.... came back home after one hour at doctors office. and it seemed not as cold.... noticed that when driving it seemed to be getting hotter(the engine is not running hot, just the a/c unit air..)...... i would have to stop at a few red lights about 6 of them and noticed that when sitting there the air seemed to be getting colder. when driving off it seemed to warm up(thought it might be vacuum as there is greater vacuum when at idle???, well when almost all the way home it was like no a/c in the car at all... went inside and had lunch... went back out to car a started it up and it was not putting out anything but hot air... the compressor was not working..... went back in to get the shop manual and started car up and its ice cold, compressor working, pressures correct...... i checked the diverter door for a loose or missing hose, but there is none and it seems that the compressor might not have been working on the ride home which would rule out the vacuum.. any suggestions??????????