The overall pressure in an A/C system rises as the outside temp rises.
There's a high-pressure cutoff switch on the high side that may be cutting
out. Perhaps your system is overfilled or has air in it?
I would bring it to another dealer or mechanic who knows a bit more about
A/C systems and will properly test it, preferably outside when it's 95+
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.