Drive-Thru Testing Location 901 N. Loop 1604 W Access RdSan Antonio, Texas 78232(Shriner's Parking Lot) 9a-5p M-F; 9a-1p SaClosed Sunday phone 1-800-834-3522Customer Service Hours8a-6p M-Fr; 9a-5p Sa Central TimeClosed SundayZoom Monitoring Available during regular hours. Email [email protected]Monitored during regular business hours.Central Time General Inquiries Name Email Phone # Message Send