EE WAS OPERATING A FARM TRACTOR. THE AIR CONDITIONER WAS RUNNING LOW ON FREON. BEFORE THE A/C COULD BE RECHARGED THE A/C STOPPED COOLING. EE'S AT THE SITE PROVIDED FIRST AID AND THE EE WAS TRA NSPORTED TO THE LOCAL HOSPITAL EMERGENCY ROOM. THE EE WAS TREATED AND RELEASED THAT SAME DAY . THE EE RETURNED TO WORK.