Toyota Repair: air conditioning, r 134a, toyota corolla

Question
hi. I recently took my 1990 toyota corolla in to have the air conditioning checked out. the a/c blows warm air when stopped and cooler when moving but never gets really cold. the repair shop told me they had to put in the old refrigerant because it wasn't converted to check for a leak. they did and determined it was the dryer(o-rings) leaking. they replaced the dryer and o-rings then asked if I wanted to have them covert it to the new refrigerant. I said yes. they said some cars also need to have the condenser replaced as well but they couldn't tell me at that time. now here's what happened, they fixed the leak, converted the system  and filled it with the new refrigerant and then gave it to me without saying anything.(tech checked it out and even gave it a road test) when I got the car, I checked and the a/c was working pretty much like it was before all the repairs(maybe very slightly colder) I took it back not 5 minutes later and they told me it could be the condenser or maybe I need to add an additional electric fan. they also said that the new refrigerant is not as cold. could you please tell me your opinion about their diagnoses and could you also give me your professional opinion about how the repairs were handeled? I really don't feel they were entirely straight with me. also, how could they return it to me, knowing it still wasn't working right, and not say anything to me(that seemed to me that they were implying the repairs were completed). thanks in advance.(I am sorry it's so long)

Answer
IF YOU CAME TO MY SHOP AND GOING OFF THE INFO YOU TOLD ME I WOULD DO THE FOLLOWING.'PRESSURE READINGS WOULD HELP A GREAT DEAL.BUT I'LL GO WITHOUT THEM. I WOULD EVACUATE AND RECOVER THE OLD FREON. NEXT I WOULD VACUUM THE SYSTEM FOR 45MINUTES. AT THAT POINT IF THERE IS A LEAK I WOULD KNOW CAUSE THE SYSTEM WOULD NOT HOLD A VACUUM. NEXT IF THERE IS A LEAK I WOULD FIND THE CAUSE OR FAILED PART AND REPLACE SAID PART. NOW WHEN I GO TO RECHARGE THE SYSTEM I WOULD CONVERT IT TO R 134A. NOW WHEN YOU CONVERT THE SYSTEM TO R134A YOU HAVE TO DO A FEW THINGS REGARDLESS. FIRST REPLACE THE DRYER AT THE MINIMUM. AND FLUSH THE SYSTEM WITH A SPECIAL FLUSH. NEXT REPLACE ALL O-RINGS AS NEEDED(WHERE REPAIRS WERE MADE) AND NEXT CHARGE IT UP. AND THAT SHOULD DO IT. PAUL P.