nice link Rj

 

Just out of curiosity, when making these tests did you attempt to simulate the problem by letting the car sit at an idle long enough to get the a/c to run warm? I don't have full set of gauges so can not comment on the readings you recieved other than the information I have and use says the readings will change as a function of outside temperature. As I use a single gauge on the low side it is basically a go, no-go indicator and it does change as function of outside temperature.
The question becomes not what it looks like when working but what does it look like when it quits.
I have done a number of freon to 134 conversions with out a problem and they will run warm at a long stop light when the temperature is high outside. The also run colder at extreme outside temperatuer too, at least in genral on my cars anyway. My Saturn however has never given an indication of a problem and it is a 94 which bascially has no grill so no direct air approach to the radiator and condensor.. All the air getting there comes from the bottom and at a stop light that is going to be dead hot air from the road surface.
I wonder if the compressor for some reason is quitting while standing at an idle?

 

Yeah I tried letting it run for awhile to see if it would act up, on one occasion the compressor did kick on and off at about 2 to 3 second intervals, this lasted for about 30 seconds, blowing warmer air than the normal cold, someone misplaced my thermometer for me so I couldn't get a reading (bought one at Advance today), but as my luck would also have it, our temps here in Georgia went from high 90's to low 70's for daytime highs and it hasn't acted up since. The gauge readings were jumping all over as the compressor cycled on and off but once it stopped it went back to the normal readings of 190 and 30, the compressor started acting up about 7 or 8 minutes of idleing. My have been an outside temp problem, I will check again when the temps go up outside again, weather here changes every 5 minutes! I will post results again when the temps go up.

 

Gauge readings will jump all over as the compressor cycles on and off, and when SHUT off should equalize, meaning high and low side should read the same.

Longer it idles the higher the heat the higher pressure and will cycle to back itself down. When it starts to cycle the temps will go up.

 

Just an update on my A/C. The weather here in Georgia has finally started cooling down and not in the 90's anymore and so the A/C has been working fine. I can only assume the high outside temps had something to do with it, but I will have it professionally checked out next year just before hot weather hits. Thanks for everyones help. I have another problem with this car and I will start a new thread for it. Again, Thanks