Thanks to your help, we’ve found a direct phone number for UPS Corporate Customer Relations. Can you take two minutes to call them now? The number is +1(404) 828-4900. You could say something like: 

Hello, I am a customer of UPS. I’m calling because I know that you do not air condition your delivery trucks, and that drivers are suffering from heat illness and death because of it. I’m appalled at how you’re treating your drivers, and would like to tell your corporate leaders that they need to step up and take care of their employees, or they will lose my business.  

Comment below and let us know what they say to you. If we flood their phone lines, there’s no doubt they will get the message loud and clear.