Help about air conditionning

[Lord Anonymous]

Hello.
First I'm french so I hope you'll understand what I'll explain...

I've a gen3 camry, 1994, 5S-FE with 350.000 kms. The air conditionner have some troubles.
When the weather is not too hot (under 30°C) and if the car wasn't parked at the sun, the air conditionner works very well, a lot of time. A few times, the cooling stops after 30min, 40min...
But if the external T° is more hot (more than 30°C around) or if I was parked on sun:
first case: the air conditionner don't work (but the magnetic clutch is engaged??? I can hear it), the outlet air is at the external T°;
second case: the cooling works a few minutes, and it stops, like the first case (the magnetic clutch is engaged).

I think the receiver/drier is out of order. If the pression gas was bad, the compressor would'nt engage.
But maybe there's a sensor which don't like when the air is too hot? (A/C evaporator temp. sensor? the lock sensor which is on the compressor? the pressure switch on the receiver?), or the A/C amplifier?

Can you help me? Is someone had theses problems?
Thanks.

[dna59]

I had the exact problem with my a/c. My problem was that there was too much freon in it and also excess oil. All I did was take out the old gas, vacuu out the system and recharged it and it has been fine ever since.

[Lord Anonymous]

Another idea?