A/C Question

[shimmersky]

Hi folks any ideas would be greatly appreciated.

The A/C system seems to work fine till a load gets put on it in extreme heat only.
Heading up the hill where i live in temps over 100F the ac just stops blowing cold

I had the system looked over and it was recomended to replace the receiver dryer and the condenser as well as recharge the system with oil and refrigerant?

So after doing this at great cost it still does the same thing????????

The system blows cold under all other conditions

It just stops blowing cold under a load in heat???????

Thoughts