CUSTOMER CAME IN AC NOT COOLING. THE OUTSIDE TEMP WAS ABOUT 35'AT THE TIME. WE FOUND THE SYSTEM LOW BECAUSE THE SCHRATER VALVES WERE LEAKING. RELPACED VAC AND CHARGE. R-12 SYSTEM. 37' VENT TEMP. ALL SEEMED TO BE OK. CUSTOMER CAME BACK THE NEXT WEEK AC NOT COOL... Login to read more.