UPS drivers face health risks in trucks without air conditioning - KVOA It’s happening all over the United States. UPS trucks are not being air-conditioned, and for some drivers, this is causing heat-related illnesses. NBC found over 100 reports across 23 states of UPS employees being admitted to the hospital for heat-related illnesses since 2015. Arizona is among those states. As a heatwave moves across the country and triple-digit heat lingers here in Tucson, the conditions can be dangerous.